Just cut the foil to match the meat 1/4” overhang. When it’s done the meat will slide off onto a plate leaving skin and foil for the trash
so theres no con fusion...in a earlier post by me i said oil the foil.....but i was cooking filets without skin...your method sounds great
I concur skinless fish fillet needs oil. When I lived in Maine used to catch striped bass- tail steaks cooked on oiled foil was the way to go. Most times a bigger fish was better cooked whole and poached in a foil tent with sliced onion lemon pats of butter and a sprinkle of thyme and dill on the inside.
fyi...i am slicing across the grain as you can see in the upper LH of the pic....it looks deceiving cause i cut (2) steaks in half