Good day all from cold and wet Melbourne

Yes I have searched but thought I would post it again as I want layman terms

2009 XTR. Done only 1800ks (actually 2000 now)
Exhaust pops when backing off throttle.
Has Scorpion cans and no other mods
I have adjusted the Throttle position sensor up from 16 to 26
Questions:
1) is the popping normal?
2) will changing the AIS reduce it? (am I on the wrong track here)?

Bike runs nicely but the popping is concerning. It's not a lot but it's there..

Thanks

Marc