It doesn't hurt to clean out the tank vent but there's like a 99% chance there's nothing wrong with your boat. High-flow pumps are a relatively recent addition at most places, if the boat wasn't designed for it you just have to go slower. As to getting fuel in the water, boats from the 2000's back were all designed so when you saw fuel come out the vent you knew it's full. There was always some minimal amount that will get in the water. Nowadays with all the new rules and regulations some fuel docks act like you just shot somebody if you get 3 drops in the water. Technically if there's a visible sheen they're supposed to report it to the coast guard. They're not allowed to use dawn dish soap in a bottle to disperse it anymore, allegedly that causes it to sink and contaminate the bottom.
My home marina isn't insane and doesn't give you a bunch of B.S. about this. Most of them still don't. But some do. I do carry a bottle of dawn dish soap mixed with water in a spray bottle so by the time they'd notice it the sheen is gone. I doubt there's some super important endangered species that's chosen to make it's home under fuel docks. If there is, maybe there's a reason it's endangered.
None of the gadgets that are supposed to stop this issue are going to work that well on these boats. They have long fill hoses and the tank vents are several feet down from the fill ports. Gravity is still gravity, some fuel is always going to come out no matter how vigilant you are about cutting the handle off when you see that first splutter from the vent. Once the tank's full to where it's sputtering out the vent, there's no way to stop what was already on its way down the fill hoses from going down into the tank and then out the vent. It's the design, it's just going to happen.
