didn't read all the responses but since I know your car I'll give my input. At the boost levels you are running now on the sc61 you are nowhere near its efficiency range and you have a decent amount of lag. Switching to a smaller turbo like an SC50 or SC34 would be a good idea for you. An SC50 will spool a good bit quicker and stiull be able to make 400-450whp and it won't require any other changes to your setup other than a re-tune.