I totally agree with the 43 helix. At 10,000 ft in deep snow it works so much better than the 48. Took an extra secondary in my backpack last time I went out (had the 48 on the sled and 43 in the pack). Traded back and forth secondary clutches on the hill and the 43 performs way better. Ordered a 44 with a stiffer spring from BDX. Unfortunately they send me a 46 instead of the 44 I ordered. The 46 with the stiffer spring works about as good as the 43. On my 925 I'm also running MDS weights at 80grams. This combo is working really well for me. Still have to try the 43 with the stiffer spring and see what it does.