I suggest you read this thread. Several people that I highly respect on this forum talk about their actual experience keeping a very small number of hens with a rooster, mainly in breeding pens. I personally don't keep one rooster with one or two hens, but I trust these people enough to feel very confident in using what they say.
https://www.backyardchickens.com/forum/viewtopic.php?id=250327
For those that won't bother reading the link, many people keep a rooster with one or two hens and don't have significant problems. Juvenile roosters are more highly charged than mature roosters, but often the juvenile roosters will mature.
Now to my opinion. I agree the rooster is ready for action after resting up all night. Mine are the same way. I think it may be a dominance thing too. When I separate a rooster for just a few minutes then put him back with the flock, he usually mates a hen almost immediately to reestablish that this is his flock.
Roosters usually mature sexually earlier than pullets and your rooster is a month older than the pullets. The pullets are just not ready for the rooster yet, but his hormones are driving him wild. It is hard being a teenage boy with no one to keep you under control, especially when you are bigger and stronger than anyone else around and can force your way. The pullets also need to mature for things to calm down a bit. It is possible your rooster is and will always be a brute but it is also very possible things will calm down a bunch when the pullets start cooperating and he does not have to force his way to follow his instincts.
Some people seem to think that any chicken mating is cruel and barbaric. They are not humans, they are chickens. They have their own way to do things. When the hen squats, she is spreading the weight of the rooster out into the ground so she is not really holding up all that much weight. The rooster grabs her on the back of the head. Part of that is to hold her, part is to help him keep his balance, part is to tell her to squat, and part is to tell her to raise her tail and assume the position. The hen shakes herself afterwards. Some people may read that as her saying, "I'm glad that is over" but it actually helps get the sperm in the right place in her reproductive tract. There is a reason for the shake.
I currently have 2 roosters, both 10 months old, with 9 hens, some 10 months old and some well over a year old. They normally free-range (no fences) so they have a lot of space. I'll list some of the things that go on in my flock. These almost always start with a rooster dancing for a hen. I very seldom see mine just jump a hen. They practically always dance first.
The hen runs away. One or both roosters chase her down and one forces her to mate. Usually the other watches but does not join in, though he may take his turn. This is not real pleasant to watch, but the hen is not physically hurt.
The hen runs away. One or both chase her a while, but she gets away.
The hen runs away. The rooster ignores her and goes about his other business. This is what happens most of the time.
The hen runs away. The rooster starts to chase her, but she willingly squats after just a few steps.
The hen willingly squats.
In the morning some hens stay up on the roosts until I let them out. I assume this is to stay away from the roosters while they are waiting to be let out. Some get down on the coop floor.
I can't tell you how it will all wind up with your two hens and one rooster. I suspect things will remain unsettled until the rooster and pullets both mature. Going through puberty is rough on the rooster and the pullets but most of them make it through that phase.
I don't know if any of this helps any or not. I wish you luck.
