ANY AUTOCROSS RACERS

255/40r18. 26" and change tall
My advice:

Raise the ride height slightly. I ran that same tire for years but used a stock lca. I ran thinner Bump stops. The window of ride height vs. Suspension height is narrow.
What are your shock settings. T bar vs shock damping is a critical relationship. I don't think 1.03 is nearly enough in this case. My guess is this car understeers quite a bit.
Do you have a alignment specs on paper?
Feel free to PM me to discuss