First of all that sure is a light car up

I have tried the 33x10.5 tire and it was too much for my car. I run NSS 10.0 class and have also run the AFX/C class and my car weighs 3450 with me in it. I found the best tire for me is the 29.5x10.5 MT. I also think that tire you are using is killing your 60ft and you also would be better off with a shorter tire. Even the 30x10.5W would be better.

I did try the Hoosier 30x10.5 radial and it was not bad but the radial did not last long at all in that size for me.