not sure if anyone has mentioned it but check the guitar first.
treble bleed cap (or cap+resistor) OR 50s wiring mod will help retain highs through the volume pot's taper and keep your chord voicings from turning to mush.
I agree with this. Gamit ko to, ako nag modify, Seymour Duncan Pickup, 331 capacitor, 500k potentiometer. try mo to, mukang eto hinahanap mong solution.