The primary spring final rate is a bit high and the secondary spring rate is low. The initial 165/310 is needed with the stock weights as they are heel and mid weighted. Running some BBT 76g weights with a 120/285 spring and a glide washer works really well. Add a 160/260 qpring in the secondary with a bearing or delrin washer for better belt hold.
Regardless of the clutching, the gearing is still too high. 1-1 shift on the QD2 is 74mph. you never going to get there in deep snow. i have been running a 29/69 gear ratio and that has helped a ton. would like a 28/69 gear ratio, but thats not available yet. These 216 belts are very hard and need more spring pressure to prevent slipping.