Yes I know what you mean about not wanting them to get in the habbit of going out a wee hours (I live in a trailer park so I too have to walk them or at least watch them very closely) that is why I ignore for a few minutes then if it persists I get up & look around the house, If they go to the door I know they have to potty otherwise I go back to sleep. But it also worries me when they do this as they too are like alarm clocks so if they do get up in the night I want to make sure everything is ok.

To help with food aggression yes, hand feed also feed less more often. It will make him think that food is more plentifull. It may disrupt his ussual duties so just keep an eye out for signs of when he has to potty.

3 walks what a lucky dog. My dogs only get 2 although they are longer walks I am sure no matter the lenghth the dog thinks 3 is better than 2. Maybe try jogging or running for one of the walks?

Good luck! Keep us posted!