Funny all these pics and advice and OP has not posted a pic yet.
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I see your problem: Roosts are too low. And top roost, which is the only one they would use b/c of bird preference is too close to back wall. (mine are 15" from back wall, which IMO is still a bit tight.) You could move nest boxes down to floor level. If you keep them where they are, you might want to put more of a perch in front of them to give them a better landing strip before entering nest boxes. Not necessary, but that's my preference. It makes it easier for birds to enter nests without risk to eggs already in nest. Can you put perches on your "tall wall" so they can be higher?
,Hello.....That is my set up not the OPs.....Actually not one issue here for my Birds...Huge Brahma, Orpingtons and Brahma/Orpingtons....They fit perfectly and all face inwards....My nests are also easy....
Oops! I didn't realize that either. Also good point, smaller birds have different needs!
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Funny all these pics and advice and OP has not posted a pic yet.
My bad, I also didn't realize that!