There is no way you had it wired correctly if you had mud on either an Evo 6 or 7. Those pickups are straight up "icepick in the forhead" clarity with a side of "Sweet Jesu - the output." I've owned a lot of both the 6 and 7 versions, and I am a freak for clarity, especially on 7's.I think the yellow on black looks AWESOME.
I've tried the Evo7 and I was beyond disappointed. I loaded it in the bridge position of an Ibanez RG7620 and talk about Stratty... The cleans were stellar, however it didnt take well to the gain channel. It was very unclear, weak and muddy. It didn't last 2 days in my guitar LOL Being that it's Vai's signature pickup, I can understand how the Evo's work with his tone... I mean his Jem is pretty much a glorified Strat if you think about it, (alder body, stratty soundin' pickups).
I've also had both neck + bridge Evolution 6 string versions loaded in a different Ibanez RG and I found the tone to be quite different. It still had that stratty sorta quality, but not as much of it. This was my only experience trying a 7 string version of a pickup that was originally designed for a 6 stringer. I'm sure they made some adjustments on the 7 string versions but IMO they weren't consistent.
Black and White get soldered together, red is your hot, green and bare go to your grounds, is usually what I go with. (Obviously you can get creative on which sides of the coils get joined, but if you stay consistant, it is usually safer.)