Regarding that fuzzy volume concern... I'd pull the tone stack out of the circuit entirely and just have the volume pots connected. See how the volume control acts when it's just pickups, selector switch, volume pots and output jack. That will tell you a lot. I had a volume pot go squirrelly recently and because it was still in circuit with the tones (Strat wiring), I couldn't tell where the issue was. I eventually figured it out but it was a weird one.