[quote name='thatgrantboy' post='1105145' date='Jan 27 2011, 03:10 PM']....Just to add....the 3 quieter strings are all brand new. However the E string is a recycled one from an old set that I've stuck on there just to string it up. I think its actually a thick gauge A string as opposed to a regular E string (although it is thicker than the brand new A string)
To my knowledge though, that shouldnt make it this much louder than the other three, right? :S
I could try the swapping around when I get the chance too.[/quote]
In theory a different string with a different amount of steel in it could make a difference. I'm not sure how noticeable it would be in practice, I mean you've raised and lowered the pup height which should make a far greater difference than a few microns on the string core.
I'd still go with an imbalance in the magnets and go for the swap.