I am by no means vastly experienced in this area, but I bonded my two recently and we had a LOT of humping, very intense. I started doing it in sections, but it was clear we just went back to square on everytime so aftera few days we just did 24/7 bonding for 3 days by which time they were clearly ok, albeit still humpy.
I did gently guide him round the right way when he went for her head, just in case, but even now he still sometimes gets it wrong, I just don't worry that she will bite now, she just ducks out the way. But initially I didn't let him stay there.
I don't think I'd let the eye grooming go on too much either til you know her a bit better.
It is so stressful though, I don't think I have ever done anything quite so stressful or intense, but very much worth it now. Hang in there!
Oh, you asked if humping is vital - in my limited experience and extensive research, it is everything for some bunnies. It is a normal part of behaviour, and I think we should try hard not to see it through human eyes or interfere with it if we possibly can. They need to work things out for themselves, in their own language, however hard that sometimes is for us to watch :roll: .