Few things you could do:
-Isolation curls
-Keep your wrist straight throughout pull (don't flex wrist at top of movement)
-Focus on the squeeze portion of the curl. You should hold each squeeze for a count of 1 mississippi.

You talked about supinating your wrist. That is only for alt. dumbbell curls. I wouldn't do those. Just stick to barbell curls, incline dumbbell curls, and maybe cable curls. Another good idea is to buy some wrist wraps and use them for your curls. It'll help limit how much you use your forearms and also help you focus on the pull of your biceps.

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