I've been using Fender 7250s and am searching for another brand where the low-B string has more definition. There are quite a few sets that contain a 130 or 135 gauge B, but I'm only interested in ready-made sets with a 125 B. I'm also impartial as to whether the B string is tapercore. If it matters, the strings are for a Hanewinckel with Bart soapbars and 18v preamp. What do you suggest given my requirements? Thanks!