Innova Evo is an excellent food. It is high in protein - but - interestingly, alot of holistic vets/homecookers use higher protein (in the 40 % range).
To balance, what if you feed some white rice w/ the kibble? That would bring the % of protein, per serving, down - you could do 2/3 kibble and 1/3 grain and that should help in bringing down the high protein.
If you're concerned about his nutrition, you could also add a multi-vitamin, some Missing Link. And, since you know he's prone to hypo, are you giving him Nutrical between meals? He's really young - I'd suggest a pea size Nutrical immed. after he wakes in a.m., between meals (if you can), and def. before bed. I'd also try to feed him every 3-4 hours given his age and hypo tendencies.
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