How long did you try bonding them with their cages by each other, and how long did you try bonding them outside of their cages together? Were there any fights in the tub? Its possible you just need to continue the same bonding routine for a little while longer so they get more used to each other. Allow humping for a few seconds, then pick the male off and put him next to the female. Keep them apart and pet them both. If you notice your female getting irritated with your male, remove him asap. Any sort of irritation can lead to fighting which has the possibility to end terribly
It could still be hormones, but if its been a month, that seems unlikely. I would give it another month of bonding and see if that gets any better. You can also try the tactic where each rabbit gets a stuffed animal toy for a few days, then swap the toys between the bunnies. Your male might hump the one that smells like your female which will get it out of his system, and your female will get used to the smell of your male being close to her