Hi Clyde, I have had a similar situation, with certain Mason & Risch pianos. The reason in my case for the excessive bass string breakage, was that the pin depth and/or angle were incorrect, causing the wire turnings on the tuning pin to overlap. This caused stress and breakage. I thought, I had figured out a fix, by backing off the pin a couple of turns, after unhooking the string, and then reconnecting the string. But in some cases the string broke, on being backed off, it was obviously too stressed. They obviously thought it was my fault, as I haven't been called back. You can't win them all. Regards, John M. Ross Windsor, Nova Scotia, Canada.
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