I'm no expert but as a Frst owner myself now I've been doing plenty of reading and talking to people. And from what your car is currently set up for I am not surprised by the lag you are getting as nearly everyone will agree that the t2 is a little pocket rocket but runs out of steam earlier than the t3.

So if you are just after the original instant get up and go this would be the first thing I would change.

And I promise that you will find a lot of people out there willing to do a straight swap t2 kit for t3 as some people prefer the higher bhp numbers possible from running the t3 set up.

I can't see why you would have to change the cam back though as the current boost is not too high.