Do mean Science Diet? If it were me, I would discontinue the SciDiet, the Royal Canin AND the chicken breast asap. All of those things could be problems. From there, it depends on what you're willing to do - are you willing to cook or do you want kibble or canned or raw?
And, have all his blood tests (liver, pancreas, kidney) come back okay?
Slimy/bloody poos can progress into alllll sorts of worsening problems, so I'd definitely suggest making some changes - the suggestions, though, depend on which direction you want to take (that determines supplements too, so...)....
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