that's good stuff people!
All sleds are prone to drifting to low side of terrain especially when loose as the drag of the loose snow draws the sled into, just like cars. Sled weight, rider weight contributes to the amount of rider strength or effort to counter this draw. I would say, YES, yammi's will be harder to counter this. If I were buying a trail sled it would still be a heavy yammi. I didn't see weight as a factor when playing cat and mouse on the trails, heavy sled with big arse motor was a good mate