gjensen, All good points and advice. Baby steps! Slow goes the process. Will start with data and record keeping of development first. Chicks are growing fast and changing very rapidly. I will do first weight check before I coop them in another week or 2. At 6 weeks old now I just now altered feed from medicated 18% chick starter to an 18% protein starter grower feed and will up that in 2 weeks to 20% meat and broiler feed. I may cut it with some scratch grains for other nutritional benefits. I feed my dual purpose birds similar feed and am very happy with both health and productivity.
Feeding is second only to genetics.
The old timers often had feeders. Men that were good at caring for and feeding the birds. Getting them in and keeping them in condition. Then managing them during periods of maintenance.
This was before the balanced commercial rations that we have now. We benefit from that, but we have lost to. We do not have the "feeders" any more. Men that knew a line, could observe them, handle them, and know what they need to get them in top shape.
Similar to how you mentioned that you liked the results of your methods. Those methods will evolve along the way based on observation and experience. We might not get to the level the old timers did with their experience(s), but we do get to know our birds.
I try to get to know my birds. I learned to manage and feed my Catalanas differently than NHs. They are different birds, so of course.
Our birds perform their best when they are in top condition. Some are more high maintenance than others. We are obligated to get them at their best though, and realize their genetic potential.
In a performance flock, there are no periods of maintenance. Performance is a 365 day a year matter. We need them in top form, equipped to excel, all of the time. We want healthy vigorous birds. Bright red combs and wattles, a nice feather sheen, good condition overall, with an ideal weight. Not over weight, and not under weight. A lot of fat is not good unless they are being finished.
Now saying this, I never mean a bird that never looks like she laid an egg. A girl like this very well may not have ever laid an egg. Still this is no reason or excuse for poor condition.
Management does matter.

