Your current ratio is 1.86 with the 22/41 and 68 pitch chain
You could go to 21/41 for 1.95, or go to a 66 pitch for 20/39 (also 1.95) or 19/39 and the 66P chain (2.05). It is not recommended to go to 20/41. Since you have studs, you could pull off the 19/39. But, that means you need a different chain and both gears, which is also a pricey route.
On my sled I don't have studs, so I went from 22/41 to 21/41 and it pulls pretty hard and gets to 70 quickly before the acceleration starts to taper off. Haven't topped it out yet, highest I've gotten so far is 85. With the 22 tooth I could get 92-98 on the speedo depending on ambient temperature.