She doesn't looks stressed out, she just looks interested in what is going on but he looks to be on 'high alert' mode (by the way, I forgot to mention it before but my male is also a bit smaller than my female).
Use a T perch to get him to step up and move him from one place to another, don't let him bite you!
I don't know if there are any other toys in their cage but the perches are too large (they need to have a smaller diameter so their toes 'wrap' around them with the claws from the front toes and the back toes almost touching but not quite) and too evenly round (bad for their toes and feet). Use tree branches with smaller branches growing from them (they like to chew on the little ones) and get them chewable toys (not made out of wood but of straw, wicker, raffia, cardboard or paper - mine love a line called Pinata from Planet Pleasures:http://www.planetpleasures.com/pinata.php) .
You said that he had 'attacked' the female when she perched on the cage but if what he did was try to bite her toes, it's not really an attack, t's normal behavior and it doesn't mean aggression or anything. I don't really know why but, for some particular reason, no bird likes another one perched on their cage no matter how much they like the other bird.
As to his screams... well, I tell you, people always say that senegals are 'quiet' parrots but that is only true of the ones that are happy because the ones that are not can scream all the time. I got a female years ago because the owner was afraid she was going to be evicted from the bird's constant screams. Once she came here, she stopped in two weeks. A couple of years went by and her previous owner (who always kept in touch and had seen that she did not scream at all here -she came to visit a few times) moved to a house and wanted her back so I gave Tobita back to her along with her mate - 24 hours later, she called me to ask me to come and pick her up because she had not stopped screaming.
He is afraid, confused, does not trust you and, to make matters worse, he is jealous of the attention you pay his female and his female pays to you so you need to win him over - it's as simple as that!





