diff --git a/src/hostdemo.rs b/src/hostdemo.rs
index 205172e..029bcef 100644
--- a/src/hostdemo.rs
+++ b/src/hostdemo.rs
@@ -1695,10 +1695,11 @@ fn session_loop(sock: &UdpSocket, dst: &str, target: &str, rng: &mut Rng, b12: u
     let mut qseq: u16 = 1;
     let mut seq: u32 = 1;
     // 发现任务队列: ★窄分支优先 (已知灯具各一个只含自己的分支 — Butler 可能拒转全范围查询)
-    let mut stack: Vec<(u64, u64)> = vec![(0, 0xFFFF_FFFF_FFFF)];
+    // (lo, hi, silent_retry_done) — 静默分支重探一次 (池上行丢包保险)
+    let mut stack: Vec<(u64, u64, u8)> = vec![(0, 0xFFFF_FFFF_FFFF, 0)];
     for u in known.iter() {
         let v = uid_u64(u);
-        stack.push((v - 1, v + 1));
+        stack.push((v - 1, v + 1, 0));
     }
     /// 一台灯具的参数快照 (参数扫描汇总用)
     struct DevInfo {
@@ -1738,7 +1739,10 @@ fn session_loop(sock: &UdpSocket, dst: &str, target: &str, rng: &mut Rng, b12: u
     let mut collect_until = Instant::now();
     let mut found: Vec<[u8; 6]> = Vec::new();
     let mut collision = false;
-    let mut current_branch: Option<(u64, u64)> = None;
+    let mut silent_prunes = 0usize;
+    let mut found_this_pass = 0usize;
+    let mut full_passes = 0usize;
+    let mut current_branch: Option<(u64, u64, u8)> = None;
     let mut sent = 0u64;
 
     println!("[S] 统一会话环启动: DMX 30fps + RDM 穿插 ({}s)", secs);
@@ -1764,16 +1768,16 @@ fn session_loop(sock: &UdpSocket, dst: &str, target: &str, rng: &mut Rng, b12: u
             if collecting && Instant::now() >= collect_until {
                 // 本分支收集结束 → 判定
                 collecting = false;
-                if let Some((lo, hi)) = current_branch.take() {
+                if let Some((lo, hi, retried)) = current_branch.take() {
                     if collision {
                         let mid = lo + (hi - lo) / 2;
-                        stack.push((mid + 1, hi));
-                        stack.push((lo, mid));
+                        stack.push((mid + 1, hi, 0));
+                        stack.push((lo, mid, 0));
                         println!("    [S] 分支冲突 → 二分");
                     } else if found.len() == 1 && found_valid(&found[0]) {
                         let uid = found[0];
                         println!("    [S] ★发现灯具 {}", uid_s(&uid));
-                        if !fixtures.contains(&uid) { fixtures.push(uid); }
+                        if !fixtures.contains(&uid) { fixtures.push(uid); found_this_pass += 1; }
                         // 参数扫描队列在发现完成后按 PID 填充 (见下)
                         // DISC_MUTE 该灯具
                         tn = tn.wrapping_add(1);
@@ -1782,8 +1786,13 @@ fn session_loop(sock: &UdpSocket, dst: &str, target: &str, rng: &mut Rng, b12: u
                         let _ = sock.send_to(&{ let mut f = f; f[0x1A..0x1E].copy_from_slice(&seq.to_le_bytes()); seq += 1; f }, dst);
                     } else if found.len() > 1 {
                         let mid = lo + (hi - lo) / 2;
-                        stack.push((mid + 1, hi));
-                        stack.push((lo, mid));
+                        stack.push((mid + 1, hi, 0));
+                        stack.push((lo, mid, 0));
+                    } else if retried == 0 {
+                        // 静默且未重探: 池上行丢包/迟到保险 — 重探一次再放弃
+                        stack.push((lo, hi, 1));
+                        silent_prunes += 1;
+                        println!("    [S] 静默 → 重探");
                     }
                     found.clear();
                     collision = false;
@@ -1791,9 +1800,9 @@ fn session_loop(sock: &UdpSocket, dst: &str, target: &str, rng: &mut Rng, b12: u
             }
             if collecting {
                 // 收集窗口内每 150ms 重发同分支查询 (真主机连发节奏)
-                if last_rdm.elapsed() >= Duration::from_millis(150) {
+                if last_rdm.elapsed() >= Duration::from_millis(100) {
                     last_rdm = Instant::now();
-                    if let Some((lo, hi)) = current_branch {
+                    if let Some((lo, hi, retried)) = current_branch {
                         let mut pd = Vec::with_capacity(12);
                         pd.extend_from_slice(&u64_uid(lo));
                         pd.extend_from_slice(&u64_uid(hi));
@@ -1807,6 +1816,7 @@ fn session_loop(sock: &UdpSocket, dst: &str, target: &str, rng: &mut Rng, b12: u
                         f2[0x30] = 0x01;
                         f2[0x49] = f2[0x49].wrapping_sub(1);
                         let _ = sock.send_to(&f2, dst);
+                        current_branch = Some((lo, hi, retried));
                     }
                 }
             }
@@ -1819,7 +1829,7 @@ fn session_loop(sock: &UdpSocket, dst: &str, target: &str, rng: &mut Rng, b12: u
                     let _ = sock.send_to(&{ let mut f = f; f[0x1A..0x1E].copy_from_slice(&seq.to_le_bytes()); seq += 1; f }, dst);
                     unmuting = true;
                     println!("[S] DISC_UN_MUTE 已发");
-                } else if let Some((lo, hi)) = stack.pop() {
+                } else if let Some((lo, hi, retried)) = stack.pop() {
                     let mut pd = Vec::with_capacity(12);
                     pd.extend_from_slice(&u64_uid(lo));
                     pd.extend_from_slice(&u64_uid(hi));
@@ -1835,17 +1845,15 @@ fn session_loop(sock: &UdpSocket, dst: &str, target: &str, rng: &mut Rng, b12: u
                     // flag=01 副本的 srcUID 末字节 = fe (SL 实测: ff/fe 成对)
                     f2[0x49] = f2[0x49].wrapping_sub(1);
                     let _ = sock.send_to(&f2, dst);
-                    current_branch = Some((lo, hi));
+                    current_branch = Some((lo, hi, retried));
                     collecting = true;
-                    collect_until = Instant::now() + Duration::from_millis(500);
+                    // 池应答软件级即时; 500ms 是线上往返时代的窗, 64 台二分要 ~80s
+                    collect_until = Instant::now() + Duration::from_millis(220);
                 } else {
-                    if fixtures.is_empty() && t < 90.0 {
-                        // 未发现 → 重新压栈全范围, 循环重试 (SL 实测: 认领后 ~27.5s RDM 才开始被代理!)
-                        stack.push((0, 0xFFFF_FFFF_FFFF));
-                    } else {
-                        discovering = false;
-                        println!("[S] 发现完成: {} 台灯具", fixtures.len());
-                    }
+                    // 栈空即收工: 每分支已带单次静默重探 (实测 64/64 一轮收敛;
+                    // 静默剪枝 ~62 个是合法空分支, 全量重扫纯属浪费时隙)
+                    discovering = false;
+                    println!("[S] 发现完成: {} 台灯具 (静默剪枝 {})", fixtures.len(), silent_prunes);
                 }
             }
         }