Correct me if im wrong, but if a gtr at 3000rpm has 2 afm's at say 2.5v each, then putting one in the ic pipe will run about 3.5v, as it has all the air running through one 80mm hole instead of two. If you then bridge the wiring, it will think that both afm's are running 3.5v, hence doubling the fueling. If you ran a bigger afm(q45) at 3000 rpm it should only see about 3v, and then bridge it. Then trim the values, or adjust the injector % until it is about right and then tune from there.