curious question ... Why would you cut it back hard ???
Not trying to be a pain here, but judging by your last virt of what you want to do, and your pics
you just posted... I would say that you would be probally better off just deciding which branches
you want to keep for lower branches, and which ones you want to make the continuing trunk of
your tree and just eliminating the others that you don't want. The one's you keep, allow them to
grow for the remainder of the year, and then next spring cut back hard.
This will allow what you kept to thicken up tremendously and carry up your taper from the base.
Remember, cutting back hard really is only useful when you either don't have anything to work
with, and you are trying to get something to bud out where there is nothing...
Or when you have your main branches in place and you are starting to work on your secondary
brances and so on...
Nice tree, and keep up the good work !!!