Gosh, young male rabbits will hump everything, but that isn't just about dominance, it's about being desperatly horny. Unfortunatly, being humped is a big insult to male rabbits, even some does need some time to wrap their mind around the idea that they could like it if it's the right guy.
Anyway, the problem is that bucks contrary to females don't do it so much to establish a pecking order by following the rules of gradual escalation - with bucks it's more likely that ones mood snaps and they go into fight to kill mode instantly. Does hump, chase, pluck fur, but it rarly goes beyond that, bucks turn on each other in berserk mode without prelude - oh, no, wait, you are watching the prelude right now!
Males do not fight for hierachy, or teritory, they don't tolerate other males around, and if they can't drive the opponent away (that's what happens in the wild) it can get ugly fast.
If you don't seperate them right now it may end in severe injuries (think about vet bills), or a maimed dying rabbit - I once came home to find a buckling sitting in a corner with a sad face, his intestines wraped around his hind legs, and 2 others crudly halfway castrated. Don't know why, but that litter matured weeks early.
Even if the consequences aren't that grave, bonding two neutered males is the most difficult combination (not counting intact males, I reckon that's close to winning the lottery if it works out, and imho your two are not on the way there).
If you don't seperate them right now and (note, no "if") they start fighting they quite likely will remember that even after neutering. Bonding (=having them living together in peace and harmony) then might very well be impossible and you'll have to keep them apart for the rest of their lives.
I've seen intact males being kept together, even ignoring the bite marks, that wasn't harmony.
Rabbits aren't just cute little furballs doing silly antics.
