roll the tone down on ur guitar to practically off. if u have already done that, remove some treble from ur amp.
I agree with the less treble. Also, I would add some gain or volume for more of a punch, and grab yourself a sixpence!

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I don't know about lowering your treble? maybe raise the others instead. You may actually be off in the mids or lows. I thought May used a treble booster with his ac30 which already has a bright switch. It does probably need more gain (only a little).