The cross bikes seem to be inconsistant about the popping. Some people say theirs doesn't pop at all, (hard to believe), and others like mine, even popped quietly when stock and brand new. The IAV is definitely the culprit. It is my view that you are wasting your time with the adjustable one, because the adaptive nature of the ecm compensates for your adjustment, somewhat. I have done testing with reducer bushings in the air line to my IAV, and have concluded that the IAV will start moving through a longer stroke to compensate for a reduced air flow. The IAV works best stock on my bike. The popping only occurs in a very narrow rpm band on decel, around 1600 down to 1200 or so. This is when that IAV valve opens, leaning the mixture. Our fuel injection is not buttery smooth and satisfying, almost every other injected bike I have owned or ridden has been better. If ridden hard, the bike responds pretty well, but just cruising around town, not to good, the honeymoon is over.
2013 Honda F6B
1951 Harley Davidson HydraGlide