Did not mean to deprecate Leesburg and Ball's Bluff, but I'm suspecting that Buff wants to wallow in battlefields as much as possible. And that who makes the best grits is not high up in his list of priorities.
Given that mum is doing this to feed his appetite for absorbing as much CW action as is possible, mum is going to have to be refreshed with some shopping from time to time. (Ergo, Harpers Ferry.)
I don't know where Buff's mind leans but, if I were him, I'd skip Ball's Bluff in exchange for a few more hours at Manassas. Or a few more hours at Gettysburg. Or a few more hours at Antietam. And, I'd build some flexibility into the schedule. Few things ruin a tour more than running out of time because you have to be somewhere else in 10 minutes. Flying in from New Zealand does require some rigid pre-planning, but I'd recommend some flex wherever possible.
Thinking out loud.
Ole