It’s possible to tune out the popping on decel by adjusting the fuel in the map with TuneECU. I never had much luck with that. I had a Power Commander on a Rocket Classic with full Jardine exhaust. It popped like explosions. I eliminated this completely by adding fuel to the zero throttle column in the PC fuel map. You could use the Penner or DNK tune and if that doesn’t work on the popping, install a PCV for $350. That seems like a lot but popping can be really extreme and annoying. You could also get the PCV dyno tuned to optimize your fueling if necessary.