My guys are solely on the raw whole prey diet, so it's a little different from what you're doing - all raw, no kibble and not ground. But I remember that when they switched, they did have some regurgitation in the beginning. Thinking that it's due to their system getting used to it. Punkin switch more than a month ago and he ceased having those moments about a couple of weeks after he started.
How are Max's stools? Are they firm or soft? I have read that too much food can also cause the throw ups and soft stools. Unfortunately, I can't recommend the kibble/raw ratios and amounts as I'm not familiar with it.