So are all 10 birds in the grow-out pen, or just the cockerels? It's 36 sq. ft., big enough for 9 birds at 4 sq ft each.
The run is 128 sq ft, divided by 10 birds, is almost 13 sq ft per bird. 15 would be better, but 13 is probably adequate.
Be clear, you have no roos, what you have are cockerels. IMO at this age, it's fairly normal behavior and I wouldn't worry too much unless I saw blood or somebody really getting beat up. Ideally, however, I'd separate the girls from the boys if you possibly can. At this point it's basically about dominance and flock dynamics - pecking order. In three or four weeks, however, their hot little teenage hormones are going to kick in and then, hoo boy! You'll REALLY want to separate the girls from the boys! The cockerels will mature way faster than the pullets and they'll have only one thing on their little minds - and they'll start harassing and terrorizing the girls. That's normal and natural too, but it's not good.