I agree with not wanting to bump up the numbers too much with food, especially since the insulin's starting to have a nice effect overall.
But I'd feel more comfortable if he'd hit the 77 at +6, not +4, especially since there's not enough data to reliably determine his nadir ATM. (The nadir two days ago at +6 is somewhat reassuring in this situation, yesterday's nadir at +8 is not.) Do you have an updated reading?
I also agree with dropping the dose tomorrow.