Most pollock I've had on the big rod (while fishing for cod etc) have hit the bait within a few seconds of it hitting the water - my best, 8lb plus hit first cast before my gear hit the bottom at the Beacons a few years back. I thought my sinker had come off hitting the water or something & reeled in about 100 yds of slack line before catching up to the fish when all hell broke loose as I brought it through the kelp close in. (Took lug & crab by the way)
So if I was going to target pollock like you suggest, I'd chuck out a single bait as normal. Then after 10 or 15 minutes I'd clip on a 3ft or so trace with a snap-swivel and let it slide down the line - the idea being that a fish might hit the bait as it drifts slowly down the line over & through the kelp. It's a technique that requires a decent depth of water though, otherwise the second trace would just settle in the kelp in front of you. Bait-wise, I'd try crab, mussel, or a nice wriggly wag-worm
Gary