If you have water coming out of your vent hose when you fill up then I think you have found your problem. Water is getting into your tank through your vent. Any water in your tank would be at the BOTTOM and it would not have access to the vent which is at the top of the tank. The water that spits out must be sitting in a low point in the hose. I wonder if you could trick someone into tasting it to see if it is salt? Condensate would be fresh.
If you can route your vent hose so that it goes up some from the thru hull first that will help prevent water from getting to the tank.
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