I have limited experience of just my two, but humping and chasing and fur pulling is a normal part of bonding for some - it certainly has been for mine. It can be a bit hard to watch as a human, but I found that doing 24/7 bonding worked better than repeated together and apart, because doing that we just went over the same ground again and again, and Freja only had so much hair - doing 24/7 meant that they progressed over time. We did find (after reading somewhere) that giving her low items to go under helped her, though the general advice is to avoid any items they can guard - but having these things meant she could knock him off more easily and avoid his attention for periods. The best things were children's chairs that had no real walls, so weren't worth guarding, but just blocked him from following her on top (though this might not work for normal size rabbits, mine are giants).
There are some good threads here about humping and bonding that are worth a read through for reassurance, but despite all the humping we never had an ounce of retaliation from Freja, she just moves away when she's fed up.
But the general rule seems to be to wait 6-8 weeks after neutering to allow hormones to settle so might be worth waiting a little longer as well?
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