diff --git a/Detectors/ITSMFT/ITS/tracking/include/ITStracking/TrackingConfigParam.h b/Detectors/ITSMFT/ITS/tracking/include/ITStracking/TrackingConfigParam.h
index 69aa3c5fdaf06..0b794ffd12b6c 100644
--- a/Detectors/ITSMFT/ITS/tracking/include/ITStracking/TrackingConfigParam.h
+++ b/Detectors/ITSMFT/ITS/tracking/include/ITStracking/TrackingConfigParam.h
@@ -29,7 +29,7 @@ struct VertexerParamConfig : public o2::conf::ConfigurableParamHelper<VertexerPa
   // geometrical cuts for tracklet selection for Pb-Pb
   float zCut = 0.002f;
   float phiCut = 0.005f;
-  float pairCut = 0.017321f;
+  float pairCut = 0.04f;
   float clusterCut = 0.170048f;
   float coarseZWindow = 0.055458f;
   float seedDedupZCut = 0.116685f;
@@ -42,7 +42,7 @@ struct VertexerParamConfig : public o2::conf::ConfigurableParamHelper<VertexerPa
   float maxZPositionAllowed = 25.f; // 4x sZ of the beam
 
   // Artefacts selections
-  int clusterContributorsCut = 3; // minimum number of contributors for an accepted final vertex
+  int clusterContributorsCut = 2; // minimum number of contributors for an accepted final vertex
   int suppressLowMultDebris = 16; // suppress all vertices below this threshold if a vertex was already found in a rof
   int seedMemberRadiusTime = 0;
   int seedMemberRadiusZ = 2;
diff --git a/Detectors/ITSMFT/ITS/tracking/src/Configuration.cxx b/Detectors/ITSMFT/ITS/tracking/src/Configuration.cxx
index f07a8f3394c05..400e221e57c53 100644
--- a/Detectors/ITSMFT/ITS/tracking/src/Configuration.cxx
+++ b/Detectors/ITSMFT/ITS/tracking/src/Configuration.cxx
@@ -310,6 +310,7 @@ std::vector<VertexingParameters> TrackingMode::getVertexingParameters(TrackingMo
     vertParams[1].phiCut = 0.015f;
     vertParams[1].tanLambdaCut = 0.015f;
     vertParams[1].maxTrackletsPerCluster = 2000;
+    vertParams[1].suppressLowMultDebris = 0; // do not suppress low mult vertices in UPC mode
   } else if (mode == TrackingMode::Sync || TrackingMode::Cosmics) {
     vertParams.resize(1);
   } else {
diff --git a/Detectors/ITSMFT/ITS/tracking/src/TrackingInterface.cxx b/Detectors/ITSMFT/ITS/tracking/src/TrackingInterface.cxx
index d8d3c1501b2c6..3f98e146996cf 100644
--- a/Detectors/ITSMFT/ITS/tracking/src/TrackingInterface.cxx
+++ b/Detectors/ITSMFT/ITS/tracking/src/TrackingInterface.cxx
@@ -346,6 +346,7 @@ void ITSTrackingInterface::run(framework::ProcessingContext& pc)
   for (size_t iROF{0}; iROF < allTrackROFs.size(); ++iROF) {
     allTrackROFs[iROF].setFirstEntry(rofEntries[iROF]);
     allTrackROFs[iROF].setNEntries(rofEntries[iROF + 1] - rofEntries[iROF]);
+    allTrackROFs[iROF].setFlags(vertROFvec[iROF].getFlags());
     if (mTimeFrame->getROFMaskView().isROFEnabled(clockLayerId, (int)iROF)) {
       auto& irFrame = irFrames.emplace_back(allTrackROFs[iROF].getBCData(), allTrackROFs[iROF].getBCData() + clockLayer.mROFLength - 1);
       irFrame.info = allTrackROFs[iROF].getNEntries();