The thing that immediately jumps out at me is the lack of digestive ingredients like probiotics and hydrochloric acid. I think your rabbits will end up with gut problems.
I'm not saying it's essential but I believe that rabbits and other animals that live in the wild eat what they need to keep their gut healthy. Probiotics is added to some feed to help with digestion and feed conversion. I use Modesto Milling and it contains Talaromyces versatilis which helps the absorption of more energy from the wheat in the feed. Manna Pro contains Saccharomyces cerevisiae. Yucca is another ingredient that most pellets contain. Here's a link to an interesting study using New Zealands that showed yucca extract or probiotic supplementation to diets significantly affected growth.What do they need probiotics for? Most feeds don't have that, animals outside don't have it.
The acid changes pH. Also not needed for any other animal.