That 6x6 is awaesome all you needed was some pizza cutter tires / wheels and you would be up a few of those misses. Your contact patch is too wide -- looked like a narrow tire pattern would grip better. It would take a lot of time and effort for 6 tires/wheels but i bet it would be worth it --- looks liek you're trying to build a comp style 6x6. Def take 1/4 to 3/8inch out of the middle of those tires and glue them back together and you'll RIP so much better.
