I can vouch for this method and the Decoy Plugging Singles - I use them on all my HBs (with exception to my YFW surface lures and a small handful of Jackal Chubbies) and am very happy.
stronger - haven't had a single hook break / failure yet. Where as various other trebles have broken / bent out of shape.
stay sharper for longer, yet to have to replace one
better on the fish for C&R purposes
safer for me as less points to get caught on when the fish is flapping about everywhere
better catch rate on hooked fish
Hook up rate is lower, but I put that down to tentative / inquisitive strikes (more so with Bream), where as if the fish wants it they will smash it (generally the case with Flathead / Salmon and YFW in my experience) and then its on like donkey kong!
Ill put some pics up when Im home Micky, but basically:
75mm DCs (as I know you use these) - belly and tail #6
50-60mm minnow / shad style HBs - belly and tail #8
30-40mm minnow / cranks - no belly, tail only #8
90mm and above - depends on the target fish - anything from #4 - #2/0
If I was specifically chasing Salmon, I would only use a single tail hook, not second belly hook. So much easier to handle the fish once you have landed it and lets face it, Salmon aren't tentative, they want it, they smash it.