Been following this thread with my own misfire problems and thought others may benefit from your insight (I've been fighting P0303 when I get well into boost, past 3/4 throttle).
I have not been able to find any information on turning off misfire codes with the DJPV - just clearing them. How did you do this, Chris? Does this also eliminate the resulting limp-mode? Being able to data log during the misfire without the ECU going into limp-mode would certainly help.
first, is your tune locked?
if it is, contact your tuner and have him turn it off...
mine is off and I can use two step launch ( lots of misfire) and not get any errors
also set both threshold to deactivation tables to all zero