Oh, boy, sounds like you have your hands full with a giant ball of testosterone. We just went through this experience with a three year old and his first "true" herd, and he did all the things you mentioned AND tried to kill my precious, ONLY foal, Phoenix!
Keep in mind that this stallion completel Level 1 of Parelli natural horsemanship training with his former owner. He was a perfect gentleman when no mares were around....but acted exactly as you described if mares were anywhere within smelling distance.
Sorry for not having any direct advice on handling the stallion, as I shall leave that to our more experienced mini mentors. However, allow me to share my experience so you know that someone's "been there" with regard to your situation.
My friend, a Parelli trainer, came over to work with him and he did the rearing, biting and kicking out. I tried hand-breeding with him, but the mares would have nothing to do with him because he frightened them.
Truth be told, I faced up to the fact that there's more to breeding than throwing a stallion out in a pasture and recording the dates when a mare is bred. It's a potentially dangerous endeavor and I readily admit that I am not experienced enough to breed with any stallion other than one that has a proven record of both settling the mares and peacefully cohabitating with them.
I have since sold the stallion of my dreams to a wonderful family friend who understands the needs, quality of this stallion and risks of stallion handling. This horse is a much happier one because I admitted my inadequacy/incompetence and doing what was best for the horse. Please understand, I'm not saying you are inexperienced, etc......but just want to share a lesson learned.
During the course of trying to "work" with this stallion that exhibited the same behaviors as yours, I turned to my mini mentors for advice. Interestingly, one of them cared enough to diplomatically tell me that the horse of my dreams will be the horse of many nightmares if I kept him....based on my lack of experience. She also relayed that she had a 3 year old stallion that she paid big bucks for, only to sell him for a small fraction just to get him out of her barn. Another told me to use a stud chain through his mouth and muzzle him in order to hand-breed him. HOWEVER, one has to ask themself, is that kind of temperment what I want to breed into my minis?
While we're on the topic, a horsewoman I truly respect raised an interesting idea, as there seems to be a proliferation of poorly bred minis that are being neglected because the "novelty" wore off. She thinks that in order to breed, one must invest their time in educating themself on proper breeding, then pass a certification test by their respective registry in order for the foals to be registerable. Yes, it sounds like "Big Brother", but perhaps we might see less mini mills where animals are neglected and better bred minis as a result.
Now, since this boy is in a new environment with the type of mares that'll kick his fanny and is handled by an experienced breeder/trainer, he's a totally different horse....very calm and respectful in the pasture. My hat is off to Nikki, she's a wonderful horsewoman and I'll always be able to see this boy and have a mare or two bred to him if I so choose.
Sorry for the long reply, but it's a very sensitive topic for obvious reasons.
Cindy