Hello pinklaces sorry to hear you're having trouble with your boys, i know boar pairing can be difficult!
It sounds like Justin is starting to hit his hormonal months and things can get difficult around this time.
Firstly how big is their cage?
You do need that little bit more space for boys so they have enough room to get away from one another, and plenty of space to let off some steam!
If you can try and introduce more hideys/ cardboard boxes with two exists so they cant bully one another into a corner, as well as being a safe haven to having some alone time away from one another cardboard boxes can be a great distraction. Make sure you remove any hideys/igloos with only one entrance- boars if feeling aggressive will corner the other boar and this may lead to the other one becoming trapped or hurt.
Another suggestion is get two of everything water bottles, food bowls, hay trays etc. so they don't have to start an argument over their food bowl.
With my boys I have two separate eating areas so that way they have some space to eat in private.
Mentioning munching....try and keep them entertained. Hay is a great way to do this, have two hay trays filled with hay, stuff loo rolls with hay and either throw them on the cage floor or dangle the loo rolls just above their heads on string. Put hay in a plant pot, in a box etc just so they have a different way of eating and playing too.
If that fails you could try a bonding bath, clean all the cage top to bottom with diluted miltons or animal safe cleaner include all toys, bowls and every inch of the cage. After doing so, rearrange the cage so it looks different. Then wash your boys with small animal shampoo and place them back in the cage.
Laura x