exactly.
Blowback is all relative.
There is always blowback.
How much depends on speed, weight of the ball, cable lowered, and even things like water temperature and cable diameter if you want to get silly.
Walleye trollers go slower that salmon trollers (generally).
So they get less blowback.
What kind of speeds are you ideally trolling at for eyes? With salmon and trout here in the Northeast I'm usually trolling at 2-1/2 - 4mph or so. When I'm targeting lake trout I'm trying for less than 2.