Has the vet done a bile acids test and a spec cPL to check liver function and to see if he has pancreatitis?
A lot of those systems sound like pancreatitis or severe IBD.
Was an intestinal biopsy done?
With the liver enzymes up, a bile acids test should've been done to make sure there is no functioning issue.
L/D canned food is not that bad and I would consider feeding it if it worked.
Can you post his blood work results?
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