One thing to consider and talk to your tech about is if the motor is tipped down and forward at stop, it will most likely pull up and back under load. So the question becomes do you/they want correct alignment on the shop floor or on the hill in a big chute?
I would guess each manufacturer and each sled for that matter has its own particular prescription (and tools I am finding) to achieve this perfect set up. Before you go shimming, spacing, grinding, or mounting, I would talk to a good tech who is mod savy on your particular sled.
Good luck. EW