just a late update:
i found the problem and it turned out my silicone coupler in between the TB and LS1 MAF there was a small tear when i tightened the t-clamp that slips over the LS1 MAF. did a leak test and heard it hissing in that area.
however i just found out the other day i have an exhaust leak on the turbo crossover. the weld separated where the one pipe comes off the crossover that connects to the turbo. sucks and i gotta tear the turbo, TB, turbo downpipe and WG out to get to the turbo crossover. here's hoping i dont break any bolts/studs in the process :-\
