Space look OK.I think for 6 they do have plenty of room though in our set up to discourage fighting?
Might 'clutter' things up a bit for diversion.
https://www.backyardchickens.com/threads/a-cluttered-run.1323792/
I too lost a bird to a scuffle, thinks she flew into run wall and broke her neck.
Even birds that get along OK, can fight once in a while.....
...or drop dead for no obvious reason.
It's never easy, but don't beat yourself up about it.