well no wonder
if you have the smc alky kit and your running the plate, then the car is going to flood out at wot and run like a pig at 12-13 psi
can you , or have you tried turning up the boost, and alky to achieve 20 psi and see if the car doesnt knock?
i just swapped turbos on my car today, and had to retune the car, took about 5 or 6 runs, and now its set at 21 psi and 0.0 knock-
12 psi is going to run rich on pump gas--
so why dont you shut off the alky kit, tune the car for pump gas and no knock, probably get about 16 psi of boost
then turn on the alky and crank the boost up to about 22 psi with a street chip and get the car running like it should??!!?!