popping is actually a normal function of the bike (to some degree) and "tuning" it out with the PCV map is technically detuning since it is a normal function of the bike. Many of those popping sounds were there before but are disguised by OEM CAT and end can.
You can minimize it by getting rid of the xtra air from the pair valve as you did with the bullet casing. I initially did similar, but to be honest, it wasn't until i installed the block off plates that i noticed a significant reduction in the popping.
another observation I have made is that the bike seems to be popping less over time......(Makes me wonder if the ECU is learning my driving style though i have no idea if it is even capable of that)
Also make sure your header bolts are tight......when I changed my headers 2-3 of the bolts were only finger tight