As for switching from Nutrena to Scratch & Peck -- I'd like to try switching foods BC Scratch & Peck is a higher quality feed.
Do any of you feed Scratch & Peck?
I feed S&P fermented. While my birds like it dry they do end up picking out favorite bits that way, so I feed pelleted feed dry. Not sure how feasible it is for you to switch (shipping cost + feed declines in freshness and nutrients if you have to buy in bulk and have to store the feed for an extended period of time), but I guess most of your feed has to be shipped in regardless of brand