Gonna pipe in a little late on this.
I recently switched over to a Livernois tune (V10) and love it. But, because of the 1-2 shutter, I went from the regular 93 tune, to the softer shift 93 tune, and today down to a new 93 tune that puts the 1-2 pressures at or near stock levels.
If you drive the car nice for a bit, the stutter goes away as the adaptive learning knocks the pressures down. But, after 3 or so WOTs, the stutter returns for a while -- I assume because the computer adjusts the pressure back up in response to your aggressive driving. I would also assume that, with stock power, that increased pressure "percentage" was fine, but is still too much for the new power. Just a theory.