Re: Magnet length question
Whatever's wrong with them, it's not the length. I can't hear any difference between a 2.25" and a 2.50". This is because they're both more than long enough to magnetize the slugs and screws, so .056" (about half the thickness of your high E-string) shorter than 2.50" won't make any difference.
Any differences are differences you would hear even if the two mags were the same exact length.