I have a 7mm stock cylinder with astound 107hp on slicks. Currently I have a stock length arm on the bike with Mickey Thompson slicks 18/9/10. I'm looking to get as most power down to the ground with out the bike standing straight up in the air. (Which it's doing now). I figure I should go with a slightly extended arm, but I don't know what size I should order. Any inputs??? Bike has a 230 pound jockey and a 135 pound on a full uncut chassis. Bike is for asphalt only. Please help. And no lean forward comments please