Looks like its working well goin off those pics, fish look awesome. I guess having the extra length and overall volume help to give them all some space. I don't have that luxury in my 5ftr i think if i added multiple males of the same species in my tank would cause a meltdown.
I have similar stocking to yours, no yellows but growing out a small colony of rustys at the moment and some dolphins as well need to bring my numbers up to hopefully curb aggression. There is constant chasing and its not just the one fish but about 4 or 5 who are constantly harrassing others, the azureas and steveni get bullied non stop, and my baeneschi hybrid has started throwing his weight around.