How long did it take for the aerial roots to take (it looks like you used the plastic straw method)?
Nice work Eric.. for indoor grown you are doing all the right things..
Time to get it into a shallow wider pot and continue with ramification.
my plan on this tree for this year is to get more ariel roots closer to the trunk and it might require wrapping the trunk with sphagnum moss and plastic. i am also trying to thicken some ends of major branches that i started growing last year before going to a shallower pot.
indoor growing is slow but its getting there.
my thoughts on the wider pot, not necessarily swallower than current, would help create more feeders for growth and greater moisture area(humidity tray effect).
How do you control the humidity levels in your grow area?
A more aggressive root pruning might encourage more nutrient flow through the Aerial roots, thickening the roots as well as the branches to which they connect.