I don't think you can schedule a trip like this. Go where you want to go. It's not like MK is more crowded on a Monday than any other day.... a book may say that, but they don't know for sure. They may have done a study but that could have been on an EE day or at a park that didn't have a new thrill ride added..... So many factors go into the crowds that it is hard to determine it by demographics.
We just go where we want and that makes us happy. Crowded or not.
I am not a US person. I'm not impressed with US. IOA is ok (but feels more like Six Flags) and US has some tired rides. I am definitely a WDW person.
My DH and DS go to US and they enjoy themselves. Although, it is a rip off to pay $100 (entry and fast pass) per person. We even had an employee discount on the entry ticket.
So, for my $100, I went to 3 WDW parks that day and bought some nice disney souvies for the family.
Have a great time.