cutting somewhere....

[Bakeoff]

I'm running an S200 with my boost cut at 20psi, while spiking to 14 before vtec and dropping to 12 once in vtec. (damn ported heads and high lif cams! )
In first gear, I can get to my set redline, shift light comes on, runs great. 2nd gear normally cuts about 500rpms short of redline like it's hitting boost cut or rev limiter, and 3rd normally is a few hundred rpms short of 2nd before it cuts.
Any ideas? Like I said, boost cut is way up there, rev limiter isn't an issue, since I know it's going higher in 1st...