I changed driver side O2 sensors before I changed the cats. Maybe when they got welded on the shop guy missed some spots? Which would make it run lean?

Hey I have a 2009 Challenger. Recently put high flow Cats on and now it says running lean. How do I counter this with the Trinity tuner?? I have the diablo tune installed and fuel turned up 6% and the light will go off for a few but then come right back on.. thanks if you have any advice.