boost problem

[chengsta]

I've just recently installed a EVO3 turbo w/ 2g install kit from extremepsi.com into my '99 spyder gst and running stock boost from the factory BCS but for some reason it doesn't hold 10psi but would rather go 15+ on which I would stop gas when I see it hit 15. This is gonna sound noobish but I was wondering how the vaccuum lines from the BCS should be hooked up. Its been awhile since I used the stock BCS. I have the TOP nipple of the BCS going to the intake, while the BOTTOM nipple of the BCS going to the turbo wastegate. Could the BCS also be bad?

my mods:
upper and lower intercooler piping w/ ssqv bov
3in catback exhaust
evo3 turbo
air/fuel & boost gauge
apexi safc - settings still at 0
etc...