I hate to say what I'm going to say because it will probably sound like I'm picking on you, but, we have lived on Table Rock Lake for more than 20 years, with our boats and other boats all around us. Thousands of boats sitting on lifts, in slips, in marinas, in dry docks, on trailers, and most boats sit a whole lot more than they get used. Most don't get used for several months every year, and some don't get used for much longer perios. Same in our very-boatey Florida area, most boats just sit, especially Snowbird boats.
Your personal experience with ethanol goes against conventional wisdom, and Boat US has put a lot of research into it.
Just say No to ethanol . . . unless you're a corn farmer.