Are you sure it's the pickups that are muddy?
The Blaze II's in the Universe are the clearest sounding 7-string pickups DiMarzio makes. (and prolly that ANYONE makes...)
I nearly dropped a load the first time I pickup up a UV777BK and heard the way the bridge pickup sounded. Note definition like nothing else, and that's with my 5150's pre-amp gain on 7... I replaced the "New-7's" in my 7620's and the stock pickup in my 2027 and have never been happier.
The extra-beefy New-7 pickup is probably the muddiest thing out there, but I don't see how any of the other things they've come out with for 7's could be clearer, tonewise, than the Blaze II.
just my 2 cents while I wait for a mix to bounce down...