You can certainly stay with chick/grower feed as well, won’t hurt them! I feed it to my girls when they molt, but All Flock is cheaper than chick feed here.
Did you all know Chewy.com sells some brands of chicken feed? Was a whole new day when I figured that out!
I use All Flock (20% protein) with oyster shell available on the side. Layer feed is low protein, usually 16%, and I feel better giving them higher protein.