Years ago, I put a Tom Anderson HN3+ in my Agile LP copy (solid mahogany). It was crap; nothing but muddy low mids, so I tried using a 1 meg pot for the volume or tone pot (can't remember which) but it was still muddy to the point that I couldn't get any pinch harmonics.
I still have the Anderson HN3+ and I'm thinking about putting it in my Ibanez RG2550 (basswood). Here's the point: I'm not sure that I even did the 1 meg pot thing correctly but if I did, I'm not sure it has a positive effect on high gain stuff. Have any of you tried this for cleaning up a muddy tone?