So when you guys are talking about tip pruning you mean JUST the actual growing tip? The tree will still be leggy and mostly empty even if there is branching from where the tips are now, at least for a while. The branches have a very willowy growth habit. Ideally I would like to prune all the main branches back to about a foot of length if feasible, just unsure if I will get growth out of them after pruning. Maybe one at a time over a period of time to leave enough foliage on the tree.
Almost all the branches would be bare if I pruned them back just a couple inches, since almost all the leaves are very near the tips.
When I first pruned the top couple feet of the tree, I cut all those branches back a few inches to a foot leaving bare tips, and nothing grew back from them even though it was at the peak of the rainy season. I gave it almost a month and then took 3 feet off the top of the tree.
Also, the trunk damage at about 3 feet was about one third to one half of the diameter deep, I worry about the tree getting too top heavy and very vulnerable to wind breakage in a storm, that is why I was considering a drastic amputation. It is healing over well, in 2 more years it should not be an issue but it will snap at that point if I get a bad storm before then.
If I didn't have the lower trunk damage and risk of losing the whole top, I would probably let the tree umbrella out with frequent detail pruning from 5-6 feet high. If I do the drastic amputation, as long as I get regrowth, in 2 years I will at least have the chance to select branches to get a more bushy but very strong tree. Usually I am pretty confident pruning trees and have good instincts in that regard but I admit this tree still has me baffled as to the best course of action.