We love raw oysters, especially Shigoku's which I think is what I saw in the video

The deep cup on this variety really holds the brine really well when shucking and that delicious fluid really adds to the oysters. I'd like to try firming some but I first want to be sure that the shell doesn't loosen up to the point that any juice is lost to the water bath, does anybody have any experience?
Cheers!
HW