Hey stone, keep the questions coming - I'm new to this but will answer when I can. I don't expect a lot of stretch, thinking 8-10" for each of the heads maybe a bit more. As far as the preempted Hashberry mainline, what I meant was that I should have waited until each of the tops of each branch grew taller before topping again. I was under the impression that I needed to top when the next branching occurred but have since learned that it is ok to let her grow until the stem is long enough (maybe each branch has three new pairs of nodes) then top and prune off the lower nodes. That will allow enough spacing between branches and in the center once the branches are trained down horizontally.
Did that answer the question or did I confuse further - I am pretty baked right now.
Let me know if you want me to try again.