I have four young children (6, 4, 4, 2) and I am always preparing snacks or meals. One of the things I do which was recommended by a 3fc'er is CHEW GUM!! It helps reduce the hand to mouth stuff.
Do you have a comfortable stroller?? I try to do alot of strollering if there is no time to exercise alone.
Also, any chance you can do exercise b4 your partner goes to work? If I do not do it before 8am I am way too exhausted move. Lots of moms in my neigghborhood exercise as early as 5:30am. I find 6/6:30a challenging but that's usually when I do it.
good luck! you can do it!!
another thought-- that finishing plate stuff is a problem for me too. What I do is immediatly log in those calories that I just popped into my mouth. Often, I realize I just had my own dinner! Then I finish with some salad and hot tea. Over time I stopped b/c I wanted to eat my own plate and not cheat myself out of a proper meal.