Ah! Oh that high carb food...well that's too bad, but it happens. It's not the end of the world...you'll get him back.
I'm guessing it's too late, but I would have probably skipped the +4 and gone to bed early. I mean ALL data is good data (you'll hear that from me a lot) but sometimes you just gotta take a break and let yourself have a night off when you know they aren't going too low. But a +4 is fine too.
I'm not sure how long it takes to wear off...was it dry or wet food?