Agree w most of the above w Tomic plugs. I never use the tow bar, always cut it off. I use 25# fluocarbon leader with sampo ball bearing swivel at 7' or more if I am using Canadian rod. I fish the 7" plugs for run fish N of Nootka in 600 series, 84flg w or without rattle is good.
They also make a 84flg like plug w pink in the sides that fish holding in front of rivers really like. I fish those in Comm bay.
The Tomic hooks really require a bunch of file time to get fishable, so For hooks I use Gami open eye siwash and I crimp those to a Berkeley swivel. I also use a small colored bead between plug and hook. Glow/green or red, mix it up. I use 4/O for 4", 5/O for 5", 6/O for the 6" and 7". Sometimes I stack beeds on the big plugs to get the hook where I want it.

The 602 in 4" is killer for BM and run fish. I do think it helps to have a flasher at similar depth or slightly below the plug on the other rigger. I also think that the wire has + effect IF your boat has right voltage , then 25' back works fine.. I run three riggers and the plug often ends up in the center deeper than the others, so then I do run 50' back.
I agree that some fish better than others. I also have 5-6 out of 40 that are all marked up w tooth marks but outfish the others. I gob smelly jelly: anchovie, herring on the face and the top of the plug + the leader.
It is true, Mr. Bucket mouth will hammer a too slowly trolled Tomic as will Halibut. I had to release a 60# butt off the flat at PT 2 days before Hali opener. It hit a 5"602 right on the deck.
A word of caution, 25# leader is very fragile with big fish you are trying to release boatside w hook releasers, Tomics float for recovery but they also pass thru nets...you may have fun getting that plug back.
Finally, no idea what speed I troll - but I go by cable angle, I do know that at the speed I fish both hot-spots w hootchies 42" back and Tomic plugs without tow bars catch fish!....get a decent fish with one and you will shun the flasher rod...