Rob, unfortunatly, the M/T tires have very little rubber on them even when new. Keep in mind they are designed to go 600 mph so the tire mass has to be kept to a minimum. Also keep it in mind that what kills tires is spinning them. With that in mind, you need to find that delicate spot where that is held to a minimum (ala traction control).
The time proven method is to either add weight or downforce, or lift on the throttle when the tach speeds up (a tough thing to judge).
As Sparky mentioned, aero plays a large part, especially in your type of vehicle.
If it was my car, I would watch for signs of tire spin, which would probably show up as a very rough surface, and then try out adding more weight, although a external wing would be better.
I would also try to determine which end of the cord is lifting and mount the tires to reverse this if neccessary. M/T tires are not directional, however the Goodyear LSR Tires are.
If at all possible don't trailer the car on the race tires.
When you get home, drop the pressure to about thirty psi, clean them off and use a UV protectant spray like 303 aeromotive protectant (available at most parts stores near the tire cleaners). Put the tires in a cool dark spot and cover them up. They DO NOT like light, including flourescent lights.
Do not leave them ON THE CAR......... nothing good will happen.
Another option would be to run the 28 inch Mickeys, which are a lot cheaper, and are rated at 300. Seth Hammond and many others have gone over 300 using them. Bob