First up where is the string breaking ? At the Nut end or at the bridge. If it is at the bridge there are several things you can do. 1) use lube like pencil led or chapstick. 2) check for sharp edged bits of metal where the strings make contact with the saddle, these need to be files off. 2) Get some graphtech string saver saddles. I use the Graphtechs and they are cool ! If your sting is breaking at the nut end consider giving it about 3 times round the peg extra wind and or a new nut (Graphtech make these also).