Grant 302
basic and well known psychic
The spin on the high speed curve made me start thinking again about a wing.....
As soon as the budget allows! This is the biggest untapped source for lateral grip available to you. If your splitter size isn't restricted either, I'd start looking at building one that you can live with on the street or is easily attachable for race days.
And good luck tracking down the misfires. I hope it's nothing serious.