I think it's best when everybody else is going BACK to school and there's no hit for year-rounders to take.  Because we've already taken it!  and end-of-trad-school is totally the worst time!  Are you full-steam year-round?  We're ending up taking it light for a bit for my mental health, which absolutely demands a cleaner house, better organized & planned homeschool, and some exercise & play. 

Yes, this particular summer we are have to  "full-steam-it" because we still have a lot of material to cover to get us where we want to be in the fall.   (We took a lot of vacations and field trips this school year which means we don't get as much "vacation" this summer.)   It *does* make it hard to prep for the school year when you are already schooling, and that is what I didn't take into account all my time off this year.  :)