Get a true CAI, MD plenum, LTH and call it a day.
you're only having a catback btw
so don't expect more ..
before the mods i would say your car was putting down ~285 whp ? with the mods u put down 299 whp ( and that's from the catback ), then after tuning you got 309 whp only and that's because your tuner didn't have enough room to play with so he probably advanced the timimg just a lil bit and maybe smoothed out the a/f ratio.. thats all.