Re: Removing Bottom Paint
The problem with frequent cleaning is that you slowly remove some of the paint--assuming its of the ablative variety. After a few seasons of monthly cleanings, you may have gone through a lot of the soft paint.
if it's hard bottom paint, it probably isn't as effective after a season and cleaning it aggressively in the water may help. Certainly you'd at least be removing the fouling.
I've settled on a strategy of a single thin coat of Hydrocoat every year, applied after cleaning--not sanding aggressively--the bottom first. I've got fuzz at the end of the season, but virtually no hard fouling, and it cleans up nicely. Maybe the fresh coat is a key--despite the "multi-season" claims for ablative copolymer bottom paints.