Nice drawing F5A......
After 50 years of doing this I settled on a method that works for my wife and I. I lay the fish down and take head off behid gill plates. A serrated knife works well or clever and hammer. Then I cut the fish up in 3" sections all the way to the tail section. Again, the clever is good for getting thru the backbone.

Now I have meal size pieces to fillet and it is very easy to follow the backbone and ribs to take off the fillets. Very little waste, and quite easy because of the size. Vacu pac like 2 filllets in each pkg. because it's just right for the 2 of us.. Give it a try. Now I've never done this on any fish over 19#,, so I don't know how it would work on the big ones..