400 half inch Osmotic Blisters
I tend to agree with your advisor - do nothing with the small ones but repair the large ones. Peeling and recoating is the only thing I know of to rid your boat of the smaller ones. It is highly unlikely that the small ones have or will cause structural problems.
From my readings, the Cat36 is a fine sailboat. I suggest contacting the builder about the pimples and also participating in the Catalina owner''s list. Catalinas are everywhere.