diff --git a/Cargo.lock b/Cargo.lock
index 351a603..e8e1669 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -745,7 +745,7 @@ checksum = "c08d65885ee38876c4f86fa503fb49d7b507c2b62552df7c70b2fce627e06381"
 
 [[package]]
 name = "ostp"
-version = "0.1.52"
+version = "0.1.53"
 dependencies = [
  "anyhow",
  "base64",
@@ -762,7 +762,7 @@ dependencies = [
 
 [[package]]
 name = "ostp-client"
-version = "0.1.52"
+version = "0.1.53"
 dependencies = [
  "anyhow",
  "bytes",
@@ -779,7 +779,7 @@ dependencies = [
 
 [[package]]
 name = "ostp-core"
-version = "0.1.52"
+version = "0.1.53"
 dependencies = [
  "anyhow",
  "async-trait",
@@ -812,7 +812,7 @@ dependencies = [
 
 [[package]]
 name = "ostp-server"
-version = "0.1.52"
+version = "0.1.53"
 dependencies = [
  "anyhow",
  "bytes",
@@ -826,7 +826,7 @@ dependencies = [
 
 [[package]]
 name = "ostp-tun-helper"
-version = "0.1.52"
+version = "0.1.53"
 dependencies = [
  "anyhow",
  "chrono",
diff --git a/ostp-client/src/bridge.rs b/ostp-client/src/bridge.rs
index dfe05bb..55f6852 100644
--- a/ostp-client/src/bridge.rs
+++ b/ostp-client/src/bridge.rs
@@ -432,8 +432,8 @@ impl Bridge {
                     }
                 }
                 proxy_ev = proxy_rx.recv(), if self.running && sessions_opt.as_ref().map(|s| {
-                    // §3 FIX: Apply backpressure. Suspend pulling from local proxy if ARQ buffers exceed 1024 unacked frames
-                    s.iter().all(|ses| ses.machine.in_flight_count() < 1024)
+                    // §3 FIX: Apply backpressure. Suspend pulling from local proxy if ARQ buffers exceed 512 unacked frames
+                    s.iter().all(|ses| ses.machine.in_flight_count() < 512)
                 }).unwrap_or(true) => {
                     if let Some(ev) = proxy_ev {
                         if let Some(sessions) = sessions_opt.as_mut() {
@@ -602,11 +602,11 @@ impl Bridge {
             padding_strategy: PaddingStrategy::Profile(self.profile),
             obfuscation_key: obf_key,
             max_reorder: 262144,
-            max_reorder_buffer: 8192,
+            max_reorder_buffer: 32768, // Expanded to prevent dropping out-of-order packets during high-speed tests
             ack_delay_ms: 5,   // Reduced from 20ms to 5ms for rapid ACK unblocking and throughput acceleration
             rto_ms: 100,       // Reduced from 200ms to 100ms for faster recovery on packet loss
             max_retries: 8,
-            max_sent_history: 16384,
+            max_sent_history: 65536, // Greatly expanded to guarantee that oldest unacked packets are not prematurely popped and lost
         })?;
 
         let socket = UdpSocket::bind(&self.local_bind_addr)
diff --git a/ostp-client/src/runner.rs b/ostp-client/src/runner.rs
index f54b62a..0c86038 100644
--- a/ostp-client/src/runner.rs
+++ b/ostp-client/src/runner.rs
@@ -153,7 +153,7 @@ pub async fn run_client_core(
         println!("[ostp-client] WARNING: process exclusions are not supported in the current TUN implementation");
     }
 
-    let (proxy_events_tx, proxy_events_rx) = mpsc::channel(10000);
+    let (proxy_events_tx, proxy_events_rx) = mpsc::channel(256);
     let (client_msgs_tx, client_msgs_rx) = mpsc::unbounded_channel();
 
     let bridge = Bridge::new(&config, metrics)?;
diff --git a/ostp-server/src/lib.rs b/ostp-server/src/lib.rs
index 4cbb7e7..83a3403 100644
--- a/ostp-server/src/lib.rs
+++ b/ostp-server/src/lib.rs
@@ -126,11 +126,11 @@ pub async fn run_server(
         padding_strategy: PaddingStrategy::Adaptive,
         obfuscation_key: [0u8; 8],
         max_reorder: 262144,
-        max_reorder_buffer: 8192,
+        max_reorder_buffer: 32768,
         ack_delay_ms: 5,   // Reduced to 5ms for drastically faster ACK loopback throughput
         rto_ms: 100,       // Reduced to 100ms for aggressive, low-latency packet recovery
         max_retries: 8,
-        max_sent_history: 16384,
+        max_sent_history: 65536,
     };
 
     let dispatcher = Dispatcher::new(protocol_config, shared_keys.clone());