Im currently bonding four and the does are causing all the trouble too

They need to be introduced on neutral ground, at the minute it sounds like you are introducing them in the other pairs territory which will always result in a fight. You need to neutralise an area like the bathrrom, vinegar is good to get rid of bunny smells (as you know bunnys mark everything) then make a small pen, they have to be in a small area so they do not have too much room for the fight to escalate, it feels cruel mine are used to a huge garage and i have all four in a little dog crate at the mo but trust me its the only way.

Id suggest you let things settle after the last fight and before you introduce them bath them so they are all smelling the same plus it encourages them to groom, if they groom eachother that is a huge step in bonding. It can take up to 2 weeks to bond them, most people say it has taken them 4-7 days. You have to be with them at all times, i move the crate around with me and made sure i started when i had days off, i do have to work today though so have a little dog crate right next to the other to seperate them until im back then have tomorrow off again.

Have a water bottle handy that you can spray water at them if they start get aggressive with eachother (ears down tails up), there will be fur pulling/humping but you dont want a huge fight and injuries. Id also wait until your does hormones have calmed abit more, 3 weeks is very early days.

Hope this helps! have a look at my bonding thread there are pics first 2 pages.

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Thank-you so much for the link : )
I will try this bonding technique, fingers crossed!
Mx