BTW...you are better doing the cleanup this fall and the paint in the spring, just before you drop her back in. Did you have her hauled for your survey?
If not...I suggest you do the soda blasting routine to:
1. quickly get down to the gel coat to determine whether any blisters are present.
2. If #1 leaves you lucky...give it an epoxy barrier coating to protect it for the future followed by the bottom paint of your choice.
No longer posting. Reach me by PM!