I replied earlier .. guess it didnt save (happens when I am at work when my boss walks in).
Anyway.. if I find a pickup too "muddy" I change the pots first. If it is a 250K I go to 500K .. A 500K would be replaced by a 1Meg
I find that when the cap value sets a point where the control says " Ok..anything above frequency X I am going to roll off" If the value is too high, xfrequency is too low and the tone control acts almost like a volume control. .22 usually is fine for most of my guitar but I do have a .18 in my Emp Reg with CC style pickup.