Your trem should be level so that the action at the higher frets is optimal, if for nothing else.

If it's set up and locked correctly with the Tremolo-No then you may it sorts out this abilty to still push the trem down. I haven't actually played aroudn with one, but as I remember the design, I can't see why this would be happening.

If the push is inperceptible ona tuner then I wouldn't worry about it

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