I reckon it's impractical on commercials, maybe a more selective bait is the better way to go such as a large prawn (still not bullet proof by any means) or a small deadbait such as a Roach.
Different ballgame elsewhere in my experience, there's feeding to bring in bait fish, as you mentioned, but Perch are hunters and so they move about hunting, so it's often a case of having something on the deck in sufficient quantities to hold them up for long enough to pick a few off once they arrive.
Chopped worm is always a good one, not selective but it's only the feed and bulked out with some krilled dead reds it will give them something to hang around for, try balling it in in riddled and dampened seed compost as the dark cloud it gives off seems to attract them.
On difficult days/waters you can leave out the feed and flavour the seed compost with a krill liquid or liquid worm and fish a bait, such as worm, over it.
It pays to think about baits as much as anything if other fish are likely to be a nuisance, big lobworms in two's and three's will reduce unwanted attention.
In other words, where everything is likely to be having a go fish baits which most won't take on and are still attractive to Perch.
Perch, and big ones at that, will occasionally become preoccupied with a fall of maggots which is useful for holding them once they arrive but you have to keep them constantly going in to prevent the fish from moving off, they'll get fed up with the ones that sit on the bottom as opposed to those falling which induce a reaction.
I think the predatory instinct is a bit like when a cat chases a mouse, when the mouse sits still the cat loses interest.
That's a bit of a contradiction to adding dead reds to your chopped worm feed but you'll find both will work, it's just a case of finding out on which days and which waters.