Your engine is still probably having trouble breathing, I know you have the CTA, but it may not be enough for 11.5:1 (jeeeez that's high), you reallt need to open up youe exhaust and intake some more. How many miles are on the car?
Ohsigmachi '96 GL MTX Zetec SS (SuperSleeper) Suffice it to say my mod list has become so long that it is just ridiculous