To be honest, I'm at a loss as to what to post.
You've been through so much to get your family on board with what Ollie needs, you've been given so much good advice here about how to go about training, as well as how to get your family on board, and your suggesting giving up on him because he is yet again acting like the puppy he is...
As others have said, he is not "too dominant" he just doesn't know where he stands. He shouldn't be allowed near the rabbits unsupervised (Honey was only allowed in the garden unsupervised from about the age of 10 months), as he is too young to have any self control - they are very exciting and this causes him to bark.
How have you gone about socialising him to the rabbits?? He should have met them (up close and personal) for very short bursts right from the word go, then they wouldn't be exciting...
I have lost count of the number of people who have said that telling a dog off doesn't help if he doesn't know what is expected of him - show him how you want him to behave and reward this.
As others have said, if you do feel that, as a family you cannot give Ollie the time, patience and consistency he needs, then please contact your breeder first, and then a reputable rescue - and please be honest with them that Ollie is not a problem dog, just a pup that you as a family were not prepared for.
It sounds to me like you all still have too high expectations as to how he should behave (and are expecting him to know what you want without showing him).
At the minute, from Ollies point of view, the Rabbits get you very wound up and cross (he won't necessarily realise you are cross because he is barking)....