First, how recently did you get the new boy? Is he neutered? Have you done any prebonding with the girls? Are you trying to bond in neutral territory?
You need to let the new boy settle in before you can begin bonding. Give him at least one month to settle into his new home before stressing him out with bonding. If he is neutered you can move on to prebonding them, if not get him neutered and wait 2 weeks then prebond.
Thing with bonding the boy with each of them means that all three would be bonded because he can’t go between each of them. Bonding a trio takes a lot of time and patience and you need to be prepared to have a contingency plan if things do not work out. You may end up with three single bunnies, a trio, or a pair and a single. You really can’t tell. But what helps is proper bonding and preparation.
Prebond for 1-2 months (at least till you see no aggression when you switch them between enclosures)
Bonding sessions: after prebonding for a while move on to short 5-10 minute sessions in neutral territory and gradually increase the better they do.
Take a look at member Sirius&Luna’s bonding journal for her trio.
In general bonding females is usually the most difficult because they are extremely territorial and can be aggressive. So two females is sometimes (not always) a recipe for disaster. I think Peanut’s prior situation might play into this as well if she was abused or neglected or left to fight with other bunnies. It could make her very uneasy around other bunnies, and she may just be meant to be a single bun.
The most important thing I can say is simply have patience, go through the process and know that setbacks are okay.