tire recommendation for 800rwhp+?

I know this is a far shot on this forum, but I specifically want to hear from rx8 members. I swear there is something about our rear suspension that doesn't let the tires stick well... I ran mickey thompson street which was recommended by some high whp rx7club forum members, but they really sucked and would spin out as soon as turbo spools up on the freeway. I know there were a few 20b guys here.. just curious what tire you guys run in the back that I can punch from 50mph without worrying about loosing control. I just can't get an R compound because our roads in arizona is sooo sandy that R compounds get coated with sand very quickly. thanks in advance!