I spoke to a long time user of dominants and he explained to me his solution for the breakage problem. He said that when tuning the strings up to pitch the tension takes a while to get distributed in the whole length of the string. When: the grooves are too tight, the tune up too fast, or the grooves not lubricated....the string will break at the point with highest tension (between peg and nut). He told me that he oils the string ever so slightly in the areas that will be in contact with the nut and bridge before installation(especially the E). He also uses the pencil on the nut and bridge. He applies the oil with slighly impregnated paper towel. He then tunes them up in steps, it doesn't neet to be hours, just allow the string to tense up evenly. He has never had a broken dominant since he started doing this. He also doesn't take them off and on.