I've always known about "dropback".....the distance of flasher from release clip and it's effects on rotation.
Any number of 4 or 5 things can affect the rotation speed and effect on lure, of course.
Boat speed
lure leader length
flasher 'dropback'
going with or against the current
brand of flasher used
I have caught fish from one extreme to the other.....from lines hanging motionless to trolling pretty fast (with flashers)
I use braid these days.......I don't really bother looking for bubbles off the line though.
Of course, like every fisherman , I am always looking for the "optimal killer setup".
Lots of things will "work".....but I am never satisfied...I want it to work better.....
Admittedly, when one is fishing where there are no fish, it doesn't matter what you do because there's nothing down there to catch.
And if you are on lots of fish......the choices are not nearly as baffling because for example, you could have 5 boats all fishing side by side using different tackle and they will all catch fish ( seen it done on WCVI).
On ECVI at times, the fish can be there, but scarce. On ECVI , you have two choices:- go where the current hotspot is.....or....finesse your game so well that if you are fishing at a "scarce" area or time you will be 'Dialed in" for the few that are around right then.
That is basically what forced me into constant "experimentation". If I only ever fished out of,say, Ucluelet, I probably wouldn't go to half the length of "tinkering" I do now..........