What do you mean not cutting well? How are you using them?[br]
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Are you "inverting them" and using the blade at a 90 (ish) degree angle to the skin, or, putting the plate against the skin?[br]
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"tuning up" a blade by closing the gap will in some cases increase closeness, but introduces a major risk of injury if you aren't careful and know exactly what you're doing.[br]
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Make sure you libricate the blade. 2 drops on the moving blade area, and 1 on the heel of the blade, before every use. Also not a bad idea to gives a spray with some andis cool lube spray to disinfect.