"I guess after your 3rd filter change in 50 hours is a good sign?"
Fuel polishing only cleans the liquid in the tank.
It does not clean the tank walls where the dead bugs and their excrement coat the tank walls.
One solution is better filtration with the use of a large pre filter ,the old style glass jar and fabric sock works well.
Centrifugal is needed for modern electronic engines , but not for most old boats.
A cure is to cut a hole in the tank and scrape the walls clean , special repair ports fill the hole.
Sadly this is a problem that should not exist.
A fuel tank with a bailable sump would have solved 100% of the fuel bugs hassle , but costs more than a box for fuel.