I use erny ball and jazz strings, and I break strings like mad some times. I've had the same problem befor. I just replaced the strings and I was fine. Like they said you might have a bit to much tention in your neck so maybe losen the trus rod a bit or lower the bridge a little, all that's in the bass help sectioin I think. I rarly do that kind of work and almost never by my self. (I break things a lot) Any ways I use steel strings but I've never really hurd much either way for steel or nickle strings I think maybe they were just lemons. Usually with me I get a few sets in a strech of two or three months and then I get a good set that lasts about a year or so and then the same thing.