the dirt you are running on in your sig looks identical to what we race on here.i ran between 14-40 and 14-42 with pro wedges but never had any luck with an 8 inch swinger.ended up with a 4 inch swing arm and 65inch wheelie bar.my tranny was uncut also but i cut 3 dogs off 3 thru 5.left in 2nd finish in 5th.was unbeaten in my class for 2 yrs with that combo(350 mod-any chassis,any fuel,no cut trannies,no aftermarket cylinders).at that time i weighed around 230....good luck