Honestly, if you're looking for rigid repeatability, you're going to need some kind of automation with fly sparging. I gravity fly sparge, but as the temperatures are starting to go nuts, I'm seeing big temperature swings using a keggle in the open winter air.
I have so many other variables to nail down first, I'm probably not going to automate that any time soon, but it's at the tail end of the list.
Only tip I can give you for the top tier is this - don't forget that you can lay the thing down on it's side and take a leg or two off very easily. Sometimes you find yourself wishing you had put something lower down on the mast and it's much easier in some cases to go up from the bottom then to take everything off and start from the top.