diff --git a/webrtc/modules/congestion_controller/congestion_controller.cc b/webrtc/modules/congestion_controller/congestion_controller.cc
index 68c306ce10..24bfd78887 100644
--- a/webrtc/modules/congestion_controller/congestion_controller.cc
+++ b/webrtc/modules/congestion_controller/congestion_controller.cc
@@ -172,6 +172,7 @@ CongestionController::CongestionController(
       transport_feedback_adapter_(bitrate_controller_.get(), clock_),
       min_bitrate_bps_(RemoteBitrateEstimator::kDefaultMinBitrateBps),
       max_bitrate_bps_(0),
+      initial_probing_triggered_(false),
       last_reported_bitrate_bps_(0),
       last_reported_fraction_loss_(0),
       last_reported_rtt_(0),
@@ -202,6 +203,7 @@ CongestionController::CongestionController(
       transport_feedback_adapter_(bitrate_controller_.get(), clock_),
       min_bitrate_bps_(RemoteBitrateEstimator::kDefaultMinBitrateBps),
       max_bitrate_bps_(0),
+      initial_probing_triggered_(false),
       last_reported_bitrate_bps_(0),
       last_reported_fraction_loss_(0),
       last_reported_rtt_(0),
@@ -216,8 +218,6 @@ void CongestionController::Init() {
       new DelayBasedBwe(&transport_feedback_adapter_, clock_));
   transport_feedback_adapter_.GetBitrateEstimator()->SetMinBitrate(
       min_bitrate_bps_);
-  pacer_->CreateProbeCluster(900000, 6);
-  pacer_->CreateProbeCluster(1800000, 5);
 }
 
 void CongestionController::SetBweBitrates(int min_bitrate_bps,
@@ -229,12 +229,18 @@ void CongestionController::SetBweBitrates(int min_bitrate_bps,
                                    max_bitrate_bps);
 
   {
+    rtc::CritScope cs(&critsect_);
+    if (!initial_probing_triggered_) {
+      pacer_->CreateProbeCluster(start_bitrate_bps * 3, 6);
+      pacer_->CreateProbeCluster(start_bitrate_bps * 6, 5);
+      initial_probing_triggered_ = true;
+    }
+
     // Only do probing if:
     //   - we are mid-call, which we consider to be if
     //     |last_reported_bitrate_bps_| != 0, and
     //   - the current bitrate is lower than the new |max_bitrate_bps|, and
     //   - we actually want to increase the |max_bitrate_bps_|.
-    rtc::CritScope cs(&critsect_);
     if (last_reported_bitrate_bps_ != 0 &&
         last_reported_bitrate_bps_ < static_cast<uint32_t>(max_bitrate_bps) &&
         max_bitrate_bps > max_bitrate_bps_) {
diff --git a/webrtc/modules/congestion_controller/include/congestion_controller.h b/webrtc/modules/congestion_controller/include/congestion_controller.h
index b70899d84b..57c2c64ff4 100644
--- a/webrtc/modules/congestion_controller/include/congestion_controller.h
+++ b/webrtc/modules/congestion_controller/include/congestion_controller.h
@@ -125,6 +125,7 @@ class CongestionController : public CallStatsObserver, public Module {
   TransportFeedbackAdapter transport_feedback_adapter_;
   int min_bitrate_bps_;
   int max_bitrate_bps_;
+  bool initial_probing_triggered_;
   rtc::CriticalSection critsect_;
   uint32_t last_reported_bitrate_bps_ GUARDED_BY(critsect_);
   uint8_t last_reported_fraction_loss_ GUARDED_BY(critsect_);
diff --git a/webrtc/modules/congestion_controller/probe_bitrate_estimator.cc b/webrtc/modules/congestion_controller/probe_bitrate_estimator.cc
index e8bcfbd984..c69bd1a429 100644
--- a/webrtc/modules/congestion_controller/probe_bitrate_estimator.cc
+++ b/webrtc/modules/congestion_controller/probe_bitrate_estimator.cc
@@ -20,7 +20,7 @@ namespace {
 constexpr int kMinNumProbesValidCluster = 4;
 
 // The maximum (receive rate)/(send rate) ratio for a valid estimate.
-constexpr float kValidRatio = 1.2f;
+constexpr float kValidRatio = 2.0f;
 
 // The maximum time period over which the cluster history is retained.
 // This is also the maximum time period beyond which a probing burst is not
diff --git a/webrtc/modules/congestion_controller/probe_bitrate_estimator_unittest.cc b/webrtc/modules/congestion_controller/probe_bitrate_estimator_unittest.cc
index 0c143b5efd..e4ec739e18 100644
--- a/webrtc/modules/congestion_controller/probe_bitrate_estimator_unittest.cc
+++ b/webrtc/modules/congestion_controller/probe_bitrate_estimator_unittest.cc
@@ -60,9 +60,9 @@ TEST_F(TestProbeBitrateEstimator, FastReceive) {
 
 TEST_F(TestProbeBitrateEstimator, TooFastReceive) {
   AddPacketFeedback(0, 1000, 0, 19);
-  AddPacketFeedback(0, 1000, 10, 30);
-  AddPacketFeedback(0, 1000, 20, 40);
-  AddPacketFeedback(0, 1000, 40, 50);
+  AddPacketFeedback(0, 1000, 10, 22);
+  AddPacketFeedback(0, 1000, 20, 25);
+  AddPacketFeedback(0, 1000, 40, 27);
 
   EXPECT_EQ(measured_bps_, INVALID_BPS);
 }