It was actually really easy to tame! The one I tamed was distracted by a little dino and I shot him with narcotic arrows 4 times I believe and not even a stack of normal meat (I didn't use prime) and it took awhile, I gave mine a few narcotic 5-7 I believe hope this helps!
Before my game got overrode I had two of these guys. They were absolute beasts, I would run around with them and farm supplies from dinosaurs. The best way to tame them is to him them once get on a flying mount get on high ground, and then pump them full of tranquilizers. They make great mounts too.