Have you exhausted All chassis tuning postions?
Some years ago Sheldon Gecker 'King Kong' S/Gas car decided after winning Bunches of races that he could do better with a new 4 link car. After trying all year with it, I believe, he bought back his old ladderbar car and continued winning races which he couldn't do with the 4 link car!!!
Have you lowered the front of the bars to get a lower IC? Adjustable shocks, front and rear? Tightened the front to keep from rising as quick, tighteded the rear to keep seperation slower? Changed low gear in tranny to a lower numerically ratio to lug engine a bit more?
What class do you race in? If it is just bracket racing you could lower stall rpm, get a looser converter, or both?