It takes a bit for them to figure out who is the top piggy. Some work out, some don't. It will take time for them to mellow out, do not separate unless you see blood being drawn or a pig isn't eating/ drinking and clearly depressed. If you separate now it could do more harm than good.
I agree with making the cage larger. Wider is always better with boars, with mine it has worked wonders.
Also, do you have 2 of everything? Hay racks/ bins, water bottles, beds? Make sure each one is far from each other. I find this helps when they are first introed with each other. Less bickering with each other if they all of their own space to munch and sleep.
ADD: Personally, I would not get another piggy for one of those boys. Unless you have enough room for 3 separate cages then it's a huge risk. Not all piggies get along and you always have to have a backup plan for if they don't. I would also like to add that I haven't had any of my boar trio's work out. So if or when you decide you want to add another boar, choose wisely. As long as you are prepared for the worst then you will be good. Sad to say, but so true!

Good luck!