I would clear up the diarrhea first before continuing again with the raw diet. Start feeding some boiled rice and chicken to settle Kenji's stomach. It wouldn't hurt to take a stool sample to the vet to check for parasites. It could also be a bacterial infection. If it's giardia or a bacterial infection, the antibiotic Flagyl (metronidazole) will help clear it up.

I think 2 lbs of food a day is a bit much. I would cut back to 1.4 lbs which is 2% of his weight. If you're not already doing it, try splitting up the meal to 2x a day.