Reds should do better than Orpingtons with the heat. I've got 6 Orps myself. Rocks do okay with the heat too. In my opinion there are just some chickens that are very territorial and I don't think it's necessarily a breed thing. I had Orps, Wyandottes, and Rocks all at the same time when I first started out. I had one especially aggressive and nasty Wyandotte that threw a huge kink in my mixed flock fantasy. Lol! I'll eventually try again, I'm sure.I still have no idea what I want for my other 2. I started out only wanting 2.. then it was 4.. and now I'm up to 6. The coop we're building will have enough space for 8-12. Looking at the "Pickin' a Frickin' Chicken" chart, it says that RIR are only hardy with cold weather. As hot as it gets in Oklahoma, how do they do with that in your experience? I really like the looks of the Plymouth Rock hens. Is hen compatibility something you have to consider? I mean do they usually get along well regardless or are there some that aren't compatible with each other. Sorry for all of the questions but I want to be as prepared as possible.