usually when it gets worse with rmp's its a bad ground, go back and clean up all your grounds with some sandpaper and some compressed air. If that doesnt do the trick did you run your rca's down the same side as the power cable? if so move the rca's to the passanger side. Also check the gain on the amp make sure its not higher then your EQ settings on your HU this will give a static sound when the sound is off but the radio is on. If none of this cures your issues come back and let me know these issues are tricky since there are so many variables. Also make sure you use quality rca cables.
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