Mine have had a backwards few days each time their space has been expanded, last 3-4 days then they're all good, then we give them more space and off they go again! Only two more big changes to go, but it has taken 8 weeks so far. Make haste slowly
When you expand their space or put them in anew space, it sometimes means they have to re-establish the hierarchy but should only take a couple of minutes.
Well rather than introduce more things where they are, I think I would try them outside, possibly from early tomorrow now. It will have been 6 days then with no aggression and in my view that's long enough.
You will soon see whether it's too soon and you will have the option of returning to where they are now. I really can't see another day or so changing how they are where they are tbh.
I don't know if I did the right thing, but I got mine in their permanent (though restricted) home as soon as possible, and then worked on adding things and expanding the space. My thinking is that I'd rather they were comfortable in the space with little "stuff" and had room to move and be comfortable as a priority over having toys and things, and I couldn't expand the space without them being in their permanent area (giants, hard enough to accomodate them at the best of times without creating big enough neutral areas as well!). But I'd probably plan to do it when you can be there as much as possible to monitor them, I slept with mine all weekend just in case.
But there are many more experienced people than me, I shall watch with interest to see other thoughts.
Aww, what gorgeous bunnies!
I'm glad things are going well with the bonding. [emoji3]