Steve, surely you don't have gassers in that 45C.Is the lack of use of fiberglass tanks on Hatterases due to no one specifically making tanks for Hatts ?
Bertram has/had the same tank problem and there are builders that specialize in tanks for their boats.
I have a 1988 40" DC and have been using ethanol gas for the last 3 years and haven't noticed any difference or any problems. Ron