7875 + 5.9 + E85 + Megasquirt

I took the car to the track last week and have a new challenge. I made three runs total, all shitty. First two were 7.70s at about 95mph and slow short times. I pegged the shift light the entire run and the log showed I was hovering around 6300 rpm the whole pass. This was at about 12 lbs psi. So on the last pass I turned off boost control and just ran off wastegate spring which was around 7 lbs psi. I went slightly faster, 7.60 but dropped about 1mph and only hit 6000rpm. I’m either blowing thru the converter or the trans is slipping. I changed fluid and filter, adjusted the bands and it’s about the same on the street just running off the waste gate. Next step is to probably drop the trans and rebuild and send off the converter or get a new one.