What kind of launch controller are you running? Reason I ask is I got the LNC-003 so I can set the two step up to hold X rpm on the foot brake, and Y RPM on the trans brake. Also I am with Bwelch the converter is to tight down low I don't think any commanded AFR/ timing ect is going to help, I realize your are running twins I have a big single but typically my car wouldn't start building boost until the 2700 range when footbraking ,my converter was doing 3400 foot braking and the car would leave on 11 psi. Can't help you with HP tuners though my car is EFI live custom 3 Bar.
Also if your standing on the brake in the burnout box you will heat the brakes and they won't hold worth a shit, my car pushed through the beams a couple times when I was setting up the two step in the pits brakes would hold fine got on the track and the car would push out JP says Do it Bad Bob style problem solved. use a line lock or do it bad bob/ John Force style.
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1999 WS6, 6.0L, S480, TH400, Dana 60
1967 GTO 496" Poncho stroker, 4 speed, 4:11s
2007 Hemi Ram
2013 Grand Caravan RT
1997 Civic
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