Does sound like the hormones need a little more time to settle. I think it might help for the next week or more to keep them separated and use a surrogate toy for each to get them used to each other again and take out their aggression on a stand in. Put a stuffy in each one’s habitat (try not to use one with the pellets inside in case they bite a hole. Not safe to eat.) and let the stuffy take on each one’s smell.
Then switch out the stuffies, so they have one smelling like the other in their space next.
See how they react, but leave the stuffies there for a couple of days. Let the adjust to the other’s smell in their space.
Don’t push the bond. They are not ready to bond if they’re fighting aggressively, but if it becomes just humping, let them do that since it’s just establishing dominance. I wouldn’t put them together, though, until you see how well they do with the stuffy toys.
Limit their time together, and be ready to separate them if biting begins.
Take it more slowly and see if they come around. Many circumstances like a neuter or an illness or even hormones being out of synch can set back a bond, but not necessarily totally, or for long.