Well like Trev said, if your gears spin freely with the mechbox shell closed and tight, then no amount of side to side shimming on the bevel would be causing this issue.
And like I said, if the bevel was shimmed to close to the motor, you'd definitely be able to hear it, and if it was shimmed too far away, it wouldn't be causing extra amp draw.
I could see a spur or especially a tightly shimmed sector gear causing extra amp draw, but not the pinion to bevel engagement.
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