software

Hello all,
I'm a newbe to this forum and skinny stringers as well. I'm a bass player who always wanted to play guitar. Anyway, I have a MIM Fender strat that I just installed a used JB JR in the bridge position. The problem is the D string has noticably lower output. I adjusted the pickup closer to the strings than the single coils. The only spec I've found is 3/32 for the bridge PUP to the strings. I don't think I have it that close yet. I've adjusted the pole pieces in an arc to match the strings and even moved the D pole pieces closer.

My question....is it possible to have just one or two pickup pole pieces bad? I understand it has a bar magnet so it's probably not a magnet issue. I'm going to try swapping the pole pieces between two strings to see if the problem moves with the pole pieces. My strings are DR true blues and only a couple weeks old. They seem much more balanced with the neck and middle pickup. It's probably still just an adjustment issue I have to work out. I was just wondering if the problem could be in the pickup.

Thanks,
GASWAF