Try the 0 degree (no reactive caster) blocks. They will make your car easier to drive.
Add front camber. Adjust to make the tires wear even. Camber is rarely used at pancars for setup purposes (there are plenty of other things to adjust to create the same effect). This will make your car more predictable, and change its behaviour less during a run.
Swap left and right tires every run to avoid tweaking it by uneven tires.
I always run my car this way (camber for even wear and continuously swapping left and right tires) and I never have to re-true my tires.