Especially for Mountain and off-trial riders, they want as little track spin as possible, so they don't just dig straight down or trench at take off. But I suppose any rider who wants less spin can lighten up their primary to achieve this.
I think there is a happy medium most guys try to find. You want to take advantage of rpm's and more torque for take off, but not spin, which just wastes power.
For your application, you could lighten up your primary a tad to lower rpm engagement for less spinning.
But you may also want to set your skid differently for a little more transfer back you your track and more traction. Traction products like studs may also help.
My sled has a similar condition to yours -- I have my limiter strap second hole from least transfer and I have my transfer rod set to the least transfer possible. It corners very well, but is not set up for great off the line take offs/ starts.
I bet you are set up similarly, set up more for high speed cornering. But that is just my suspicion, not trying to be nosy!
But back to your question, you could lighten up your primary also for less track spin too -- you have less rpm's and less torque in play when the track starts spinning.
Please just keep in mind I am no racer or clutching guru. Others may want to chime in here with thoughts too!
Mike