Welcome to my world.
Do as Gatekeeper says. If your list is not at least 3 pages long, you're probably not being honest.
I don't see how the blisters could possibly get worse. Pull it ASAP, clean the bottom, and mark all blisters with a Sharpie or something right away. Often they will lose swelling and you can't find some 6 months from now.
Use the backside of a screwdriver to tap & listen for funky sounds. I have had superficial blistering on mine that is undetectable or nearly so with this method though. Only sanding all the way to gelcoat revealed things.
If you can, grind open any blisters right after haulout. Rinse them out & let them air dry for as long as possible. More water outta the hull = better. Removing old antifouling or other coatings will help with this.