dirt hill climbs the shorter arm is better, any track condition its better, and you'll hole shot any +4 arm in any condition street dirt or sand
I took my -2 with me to silver lake. I wasn't enjoying it to much with the stroker. Holeshots sucked. I couldn't keep the front in down while sitting on the tank taking off in second. I do run some mean ass paddles though. If you ran the right paddles you'd probably be okay. I'm over 200lbs too.
I do like the minus 2 on the track, trails and technical hill climbs and all around riding and traction.
I'm going to get a plus 4 for the dunes and drag races on the hills. Mrmatt was running a +3 on a stock motor and I had the -2. He was smoking almost everyone out of the hole on sand. I'm sure it'd be totally opposite on the dirt. He went back to the -2 when he got home.