There are few things that make pu sound muddy or ditry. Pu design, quality of construction, eq of a pu, and pu output. As far as output, more output -> more dirty. It may not always be like that cause other factors may intervene..but if you have 2 pu that are the same except for the output,one with more output is more dirty. Very high output stuff are very powerful and very dirty..low output stuff can be extremely clear(if good design,don't expect some lousy low out pu to sound clean). I like to put medium output stuff cause they can sound very powerfull with good overdrive,and can still be very clear and defined. Extremes are much harder to tame. It's hard to get good overdrive sound with something like low output Fender single coil, and almost impossible to get very clear and defined sound out od something like X2N. As far as V8,V7..they are not very high output but not so good design either so they sound a bit muddy.
Tone Zone is more quality design but also more output..so result is more power with about same amount of muddyness. Altough DiMarzio and likes are more quality..they are not miracle makers..so high output still means much dirt too
If muddyness bothers you get more quality designed pu with not much more output. I swapped V2 for Air Zone and got much more clarity, much more definition and even a tiny bit more power..cause it's better designed. And I heard a crazy advice(thanks JimmyJ) to put V2 in the neck..and as lousy it is in the bridge..in the neck is very nice(maybe V8 could also be nice in the neck?)
