Yeah the spacing on those roosts is problematic, as you noted they're too close to each other and too close to walls. But I don't see a great place to move the 2nd one to, as the human door prevents you from putting one over towards the nests.
This is a bit haphazard of an idea, but what if you did just 1 roost, and then maybe a couple sawhorses down the center (or if not sawhorses, something similar... basically a free standing removable roost), so some of the birds could roost on top of those? This way you'd still have some roost options, but they could be removed for access/routine cleaning.
As far as ventilation, best place in this style of coop is to open up the soffit space between the roof support beams, like so: https://www.backyardchickens.com/threads/coop-modification-recommendations.1517556/#post-25543595
This is a bit haphazard of an idea, but what if you did just 1 roost, and then maybe a couple sawhorses down the center (or if not sawhorses, something similar... basically a free standing removable roost), so some of the birds could roost on top of those? This way you'd still have some roost options, but they could be removed for access/routine cleaning.
As far as ventilation, best place in this style of coop is to open up the soffit space between the roof support beams, like so: https://www.backyardchickens.com/threads/coop-modification-recommendations.1517556/#post-25543595