I also have a 2012 Margay and have had no issues with the cooler draining anywhere other than the bilge. I replaced the original trailer tires with Kumho brand and they are wearing fine. Still on first set. Sorry you are having the issues bassnguy.
intlwaters – I am running a merc 150 4 stroke on my Margay and seeing 65+ with a 25 pitch tempest plus. My prop centerline is 3.75″ below the pad. I would set yours at 4″ below the pad and expect to see vast improvement from your current.