Hey Tony,
Are sorex tires sold in the set of four or a pair of two? I'm currently running the Tamiya B2 compund tire. It is very much like the Sorex 36R's. They show very little wear after many runs. Tamiya's type A slick and B slick just don't hold up to the track at socal. It shows wears in about two runs.
I bought my B2 tires at TCS. Which is sooo much cheaper than what the dealers are selling. But I only bought a set of four.... which is a big mistake..... should have buy more......AHH~