3mm does sound quite high. I would think 1 to 1.5mm underneath is plenty.
Are you running std or low profile servo? I would suggest putting the weight around the servo if it is that thick.
Did you put longer screws in to hold the servo in place due to the extra height? However I would drop it back down.
Can't remember exact weight I have in the x2c but around 40g ish sounds right but that was standard size servo. That's using a piece of brass shaped to fit in the chassis area around the servo.
You should have popped over at Ledbury I'm sure we could have helped you out.
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