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You should always use the blower, 1st thing you turn on when you get to the boat. Run for blower 5 minutes before you start the engine especially after fueling. also open engine hatch to let more fumes out.

As for the smell of fuel in the bilge there is a product called bilge wash, smells like orange peel. You dump it in and agitate it with a hose and add water. It emulsifies any fuel or oil in the bilge and can be rinsed out. That cavity under your tank will probably drain once under way and you will need to wash it out a few times to completely get rid of it.

I have never seen a GTX but I just pressure tested a tank in a 16SL. I disconnected the vent hose at the vent end and hose clamped a pressure gauge in it. Then removed the fuel line from the motor and clamped a tire valve in that end. Pumped air in to 5 pounds with a small 12 volt compressor and it held for 2 days. I have no leaks. Once pressurized remove the filler cap to let the air escape do not do it from the tire valve it will just spew fuel.