Haven't played with much caster yet but I am going to change it for our next race. Things we have tried are, 3rf camber to 2.5, 47.5 nose all the way to 45, which it ran much better the less nose we took off of it, we have moved the rf caster block to the forward position because it was rolling on the rf way to hard and causing the tire to roll over and kart to bounce in the front. 58.5 left to 61 left, 67 cross to 72 cross. We run in the southeast Carolinas and such. The chassis designer and myself are very good friends we talk about changing things on the kart all the time. It's not radically different than mainstream stuff, but one of my drivers has Rode a premier v1 and v2 and a scythe 083 and now ours and says ours produces the most grip of them all. I plan to play with spindle degrees at some point as well. Like I said, the owner/my buddy just had his first child so he has had to take a step back from going to the track with us for a few weeks but will be back soon. Before that he was always at the track with us as we tested and tried different things. I am not a slouch on tires by no means, I know what I am doing there, that's why I was brought on to help him with this venture and how it started. Gone from brand new tires, to few months old, to rerolls, to no rolls, to straight regular prep to aggressive prep. THANK YOU ALL for every bit of input and help and knowledge you have chose to give me it is very much appreciated.