way too much text to try to read for my ADHD ass..
1st and 2nd gear, your probably seeing alot of belt slip, and thats why your not getting your full boost...happens to me in 1st alot with the auto.
as for stalling, are you correctly recirculating your BOV? the stall after letting off sounds like symptoms of a atmospheric vent on a MAF car.
top of 3rd and 4th is when you'll have the most load on the motor, and thats probably when your injectors start coming out of the extremely rich state your in and lean out to a reasonable AF.
on my LT1, im running 42's and there is no damn way in hell i will go WOT again till i get it tuned...my AF is about 8.5:1 roughly, the wideband couldnt read any richer than 10:1. if you have no tuning, and are running that much injector, i would be VERY careful how you drive it...stock injectors are 19lbs correct? basically at idle, out of boost, your dumping more than twice the fuel you normally would. i suggest getting a tune ASAP, that much fuel could wash out the pistons.
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El Pendejo Loco
2002 Suzuki Hayabusa
1507 "dry" block
Brocks megaphone
Spencercycle 10" swingarm
MPS auto shifter
Hays convertible clutch
Yea, that about sums it up...