Most of the carpet setups I see run around 20wt oil stiffer in the front of the car and then 1 to 2 springs stiffer in the front than the rear. I normally see 40 wt oil in the rear and like 60 in the frontMost run purple Jaco rear foams and plaid front Jaco foams. Use tire compound on the rear and about 1/2 of the front inside tire.