Definitely add fuel from high RPM down to about 800 RPM at zero throttle and the next lowest throttle setting (either 2% or 5%, I forget now). Add 4, run the bike, if it still does it add 4, do it again. I think I ended up with about +12 at low RPM to +16 at higher RPMs. You could start at +12 for instance and see if it still pops, if it does add 4 and do it again. I did this to get rid of backfire on my 2006 Softail Heritage with Thunderheaders. I still might get one pop once in a while if I went fast from hard throttle to little throttle at high speed (60 mph+). It really worked out well for me.