Take out the low-mids on the screeching vox, so the extra frequencies don't interfere. As for the low-end on the percussion, just use a little bit of that, and use an equalizer to scramble down to get rid of those unwanted frequencies. I think the mid-range could use it too. The ride-cymbals actually don't need much high-mid frequencies, so u can take some of that out. That's all I think there is to it.