Ok, I have one big problem with your post of the prepared Bluefin! You did not send me your address and invite me for dinner. I can live with the other short comings in your post, but really no invite!
Chad, try some sushi rice and thinly sliced BFT on soy and siracha sauce with a dab of rice vinegar mixed in. Simple, but HELLA delicious! BFT and YFT get mushy real quick so I ice slush them (bleed them if possible), then take them straight into the fridge. Primo product.
I will give that a try sometime. We did bleed them on deck (as the picture shows) and then once the bite was over we did get them on ice in a kill bag. We had good ice so they stayed very well. We ran out of room in the kill bag so a few of the YT end up in a fish box that doesn't hold cold as well, but too many fish for the kill bag is an okay problem to have.