In the 25 years that I've been using wah pedals I've had a love hate (mostly hate) relationship with them!
The problem is that I can get a great sound from them with a clean amp and no overdrive or fuzz pedal but as soon as I add an overdrive or fuzz the wah sounds awful! At times I can get it to sound good, but the next day, the same setup sounds bad to me!
I've used my fuzz before the wah with great results, but that's a more radical, less natural tone.
I've been considering a wah output buffer.
There are three that I'm considering-
-Fuzz Central's wah buffer instructions (this is my first choice)
-Foxrox buffer
-Area 51 buffer
If you have any experience with any of these buffers, or any other alternative, let me know.
BTW, how did Hendrix, Clapton, Page, Beck, etc... deal with this. They all had great wah sounds, even when they used fuzz pedals.