You hit the nail on the head. That's why i hated eating fish when i was younger. When I had fish, it was simply taken out of the salt water it was soaking in and rolled in some shake and bake and cooked. Their was too much of the original water still on the fillet when it was cooked.
When I fillet my fish i throw them in water as i'm cleaning
when i'm done cleaning I get new bowl and rinse and inspect each fillet
when i'm going to cook I rinse them again, one by one
I use paper towels to dry all the fillets, I'm not shy about using a bunch of towels either.
Once dry, then you start cooking. If you don't get those fillets clean, you might as well throw them out. I also think the eggwash is a big factor that eliminates the fishy taste.