God knows how you've broken the alloy mounts, unless you got very poor quality ones.
And you don't want to shim the diff TOO tight. no extra spacers are required, just move a thick shim over to the outside. I run a 4.5 sintered brushless and have no problems at all with gears.
Don't grease the gears either, just put them in dry, they just grind off a little powder instead of a thick grinding paste with lube.
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