I found that my transmission, whether in manual, drive, or sport, will not shift from 2-3 when I have it floored (w/kickdown depressed) unless I let off the gas. 1-2 happens seamlessly. Due to concerns over my license, I haven't tested 3-4 at WOT.

Eurocharged Stage 2 flash, MTM TCU. Any ideas? It *feels* like the engine is really screaming at the end of 2nd gear and the transmission doesn't want to attempt the shift until the torque is reduced, and then the shift is a bit rough. That's what I'm imagining anyways.