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I have a 1989 Outrage and I don't generally use much gas every trip out. I add gas every time I run my boat, usually 15 to 20 gallons and also always fill tank when I return.
My question is with a 63 gallon tank should I after a while drain the tank and put fresh gas in?
I have always filled my tank after use to keep down condensation and have never seen any water in my water/fuel filter.
Another thought was just filling the tank half full and that way would have fresher gas.
I add stabil every time I fill up.
This question may have been asked before and if so I apologize.
I think you are doing everything right. Keeping the tank somewhat full reduces the risk of condensation, and the Stabil prevents varnish from forming in the gas.