The problem is, roosters do not understand ratios. Both roosters are saying 'Hens all mine. Other rooster needs to die'.
Even my old roosters become rammy in the spring when the hormones wake up for the breeding season.
Like I said, having two roosters shouldn't be a problem with even 10 hens IF the roosters work out their pecking order and one becomes flock leader and the other first lieutenant. Plus IMHO, if you have one rooster and it dies or is killed, a second rooster will be worth his weight in chicken scratch. Find some way to separate the boys from the girls for now then try releasing one with the girls.
They don't need Hotel Ritz accommodations, just somewhere make shift where they can cool off. I keep home made chicken wire/wood frame panels that I have made myself on hand that I can cable tie together into a an emergency pen when the need arises. A few bricks with a board across and voila! you have a pen.
Don't be surprised if they start fighting. Roosters will be roosters.