I have tried a lot of things described above without much luck. However, the last few months I have been approaching my nail breaks and peels as if there was a fungus not visible to my eye. After shower, I daub white vinegar on them. At night I rub some Vick's vapo rub in them before retiring. In the morning I rub coconut oil on the. Every few days I paint the tips only with clear Orly nail defense. They are doing much better and while not super long, at least they are not breaking constantly or peeling, and now are peeking over my fingertips.
1965 Krempel Classical (660ish mm)
Martin Sigma DM-1 Dreadnaught (std)
2011 Cordoba Cadete Classical (615 mm)
2014 Martin DX1AE (std)