The being the younger kid at school makes alot of sense to me...my DD is like that also. She does try alot harder, and "proves" she is capable of having control over herself, when there are older kids.
I bet you'll have a fun summer and the 1/2 day 4K sounds good. I like the "shoving protein" thing, it's so true. I won't let DD go to school or anything "important" without that, and she really needs it for morning snack too.
Maybe if you feel more relaxed in the WI setting he'll feel better too. We can't help it, but sometimes the vibes we send out actually fuel the fire. I am very conscious of it, but sometimes life (and personal upbringing issues you have to deal with yourself!) gets in the way. But we do our best.
Today DD told me I was very beautiful and gave me a sweet kiss and a big long hug.
: - )