The R-6 shock bolts right up u can get a brand new -2 swinger on ebay for 200$ from the swing arm shop . You might want to drop to a 15/40 that should slow down the wheel spin out of the hole. Going down a thooth in the rear is going to drop your down end a little and help you a more on the top end. I have found out playing with the rear sprocket helps me out alot more then the front to get a hole shot . Get the rear low as u can I have found it I can keep my front end 1.5'' to 3'' higher then the rear when seating on the quad it help me get more traction .
I run a stock swing and I can get mine to hook up good on the ice. I can walk around a 600 CBR in a warrior frame ( i know gay but cool lol ) and a built trx540 ( so the guy said lock up and all fast quad but the shees got more ). I run a 3/8 mile track with banking and a 14/40 gearing .with 20'' holeshots with 500 kold kuterz in each rear. and I go 240lbs ( I know I'm fat). if you need more help pm me . I live to help out other BHQer's