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If it isn't distorting, but won't go any louder, it sounds like you may be restricted due to the power feed to the amp.
In other words, try upgrading the power feed to the amp (get some decent high-current power cable, not the usual automotive 18strand stuff). Also, if you haven't already, upgrade the speaker cable - you'll be loosing shed-loads of power through this. Upgrade you alternator for serious earbashing...
It's a cheap solution. If it doesn't work, then at least you will have done all the groundwork to putting a bigger amp in.
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