I am feeding my 27 month old hens a Non-Medicated Starter-Grower 18% Protein with Oyster Shells in a separate container.
I have Golden Comets and they feather pick on a 16% Layers feed.
I can get 20 or 24% Starter-Grower feed even a 22% Meat Bird feed. But I've found 18% is enough for my girls. My hens love the feed. The only downside is it doesn't come in a Pellet.
If you can get a 20% Protein feed that's Non-Medicated, I would go with that. Mix it 50/50 for a couple of weeks with your current feed, then just the higher Protein feed. Don't forget the Oyster Shells or crushed limestone, whatever is available in Canada.
I recommend a 18-20% feed for a backyard flock of chickens year-round. GC