Re: A question on Wah pedals
It kind of depends. The wah pedal is basically a pot that controls a boost for a frequency. By rocking your foot back and forth, you shift the frequencies that are being boosted/cut to get the classic wah sound. If the particular note you're hitting is not as close to the frequency voicing of the wah, there will be a minimal effect on that tone.
Is the problem apparent throughout the fretboard, or only as you get higher up on the high E?
If it's only as you get higher up, I'd say that the voicing for that wah model is geared more towards mids than the treble frequencies you're dealing with and you need to tweak a little or try a different model.
If the problem is present across the fret board, the problem is a weak effect and should try something different.
In either case, it has nothing to do with your single coils.