So i put some slightly heavier strings in my guitar which has a floating trem and now the back of the trem is sticking up. I heard i should do something with some springs in the back?
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tighten the springs until the trem is level and it's staying in tune

This one.
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Yep, you need to tighten them, not loosen. About 1/2 to 3/4 turn each and re-tune, re-check and repeat until its level again.