Funny you mention not putting the drain plug in... I have a good story about this.
So about 2 years ago I put my Epic in the water and do the 15 min cruise to where I moored it (now it sits in my driveway). Got there, throw the cover on and went home. Come back the next day, and the platform is under ~1.5-2in of water. Thats weird I think, then I pull the cover and get inside. Pull the battery compartment access panel (99 E22) and its FULL OF WATER!!! Hit the bilge immediately, and it slowly starts emptying it. basically doesnt get anything done, button it up and come back a couple days later. Take it out and it takes off really slow, like its really heavy (haha) but then all is fine. Pull the access when I park on the lake, and its slightly full. Take it back and cover again. Come back and realize that I didnt check the plug when I put it in about a week or a week and a half ago, so I take it out. Plug is hanging there and the bilge is just spewing water. Long story short, you can fill the hull of an Epic 22 and it will still run fine!! No problems, but I have run a couple batches of biodegradable bilge cleaner in there to hopefully make sure there arent any issues. Needless to say, I screw the plug in at home and then double check right before it goes in the water.