Oh Dear, please do not give up yet, it is very early days and I mentionned before that things can go well, and suddenly you get a fight out of the blue.
There are two ways of looking at the situation, IF the bunnies are only mounting one another and tugging at fur, this is acceptable behaviour and you should try and keep them together. If you separate them then each time they are re introduced then they will have to reassert their territory and fights may erupt.
If however serious fighting has occured, ie the bunnies are actually biting at once another, then a different approach would be needed. In this case,
I would reduce the time the bunnies have together and do supervised short bursts of bonding, and then allow them to go back to their own quarters and space.
we have had this exact same scenario many a time, and persistence definately pays.
You cannot expect too much so soon..it would be like a human living by yourself doing what you like when you want, and then suddenly having constant company, and no space nor time for yourself.
It is something the bunnies need to get used to over time...and a few weeks to a Month is not usual to get rabbits bonded well enough to be together full time.
Do not be disheartened, after your Doe has been spayed and has had time to recover physically (ie when the stitches are taken out) try them again, and it may work out better when her hormones levels have been reduced post op.
Best wishes
Adele