Clutching and jetting question 500 sxr

[Newfoundlander]

My brother has a 2000 500 sxr with reverse and a 1.25 ripsaw track. We are at 0-2000 ft temp to -25 C He always found the sled hard on belts excessive clutch heat but when he changed to the 1.25 track the sled was harder on belts lost a lot of bottom end and would not pull top rpm so he dropped two teeth on his top sprocket because that was the one they had at the dealership at the time this made the sled a fair bit better. We are going to do a complete rebuild on the clutches so I did a search on the forums and came up with 8ab yamaha weights and 47/41 helix. And 2.4 grams in each hole of the weights. I was wondering if this works with the 1.25 track and what gears to use and any jetting that you may have used.

Thanks