For what it's worth... I'm not a les paul guy. Would like to have one some day, but my guitars are strat based.

As I understand it, most les pauls (and I'm assuming clones) are going to mahogany with a maple top. Mahogany from what I hear seems to be a warm wood. Will probably accent and bring out more lower range frequencies.

If you are having trouble with mud, I'd look for a pup that has less lower frequency output and more mid/upper range frequencies. I'm thinking that might help balance out the frequency band.

I know that I put a Duncan JB into an alder body and it really sounds great. Has nice high frequency response and great mids. But again, thats a strat.

Have you visited the Dimarzio and Seymour Duncan forums?

Oh and welcome to tone chasing. It can get maddening. :D