Thanks everyone for your posts.
Here is what I am doing:
Conneting AC and DC grounds together.
Installing a
Galvanic Isolator
Removing the Zinc that goes through my strut.
I don't have an silver chloride thing-a ma-giggee and don't feel the need to do those tests, since all my through hulls are in good shape.
I will hire a pro if after doing the above, I continue to go through zincs quickly.
That should take care of it.
I'll report back in June.
Happy New Year to all!