Hey late to the party here, but I have the same unit, and had the same problem. I have the 2018 Bronze LE, and glazed the belt plowing snow the first season, but not that bad. Ya kind rough jerky take off's. It corrected itself over the warmer season up here in Upstate. Just made sure I shifted down going up steep grades. Good to go now, belt broken in good now so no need to shift only on that rough slow steep stuff.
2018 Sportsman 1000 XP LE (Bronze)
Rigid D-Series Driving LED Lights (addl Front lights)
Auxbeam LED Lights (Rear lights)
Polaris Ultimate Series- Front Bumper
Polaris Ultimate Series- Rear Bumper
Polaris Ultimate Series - Steel Rack - Front
Polaris Ultimate Series - Steel Rack - Rear
Polaris handguards and mount
Polarisģ HD 3,500 lb. Winch
Polarisģ Pro HD Winch Upgrade
Krator Universal Black Motorcycle Mirrors
Glacier Pro Plow Blade - 66"