Electrolysis / Keel stepped mast
Just an additional thought.
I use a electric fan dryer to keep the boat air dry. It is sold by West Marine and called the "turbo dryer". I run it year round 24 hours a day. It has worked now for 5 years straight! It keeps the moister in the boat to almost nill. Consequently, there is no mold smelling things growing in the cushions and nooks/cranie''s (nautical term!). In addiotion though the bilge stays bone dry. I pull up a few floor boards and the 1/8 inch water you speak of dissapears. I do however have a shaft log that does not lead much. In winter when I do not use boat much I tighten it down a bit more than usual.