Retune my entire carb after installing new heads?

@DrCharles I'm surprised you’re surprised by having to retune the carb when the combo changed. Yes, by your own description of afr readings your new combo is tugging on the carb differently from the old combo. Tune it up. Sounds like it needs idle air bleeds, maybe transfer slot restrictions, and cruise jetting adjustments (15.5:1 to me is a little lean in cruise and might cause it to rattle in tip in). And all of that will get you to where you can tune secondary jetting and pvcr for WOT.