It does have some similarites to your Hawthorn is some ways.
A few older links I can use and some background to kick things off.
As first observed at a development site in 2006.

I hacked at it over the years and collected it proper in August 2011. The hacking probably resulted in two sharis.

I got the rootball down to get it into this pot where it lived for a year.

Into a pot last spring.

Never felt happy with the 'daughter' and after advice in a earlier post I went for a branch option.

It has some nice flare and spreading finger roots one side (under the lean, thou not visible in this set of pics). The opposite has neither, in fact it has 1.5cm reverse taper which can just be seen in the pics which the Ash workshops were chosen from. This is probably due to no cork bark below a point. I did try to start some root action in this area by toothpick method, but it could be a long journey to improve this. To bring any root up, would mean increasing the lean and highlighting the flaw. Whilst on taper, the larger shari introduces reverse taper as it probably costs a section of tree half its true width. I had often thought I may be able to work this shari up into the obvious huge cut, hollow out maybe? This may reduce the width of the truck between the chop and the shari.
Photos to load tomorrow showing defoliation and wired are a significant change. It screams out for some ramification which I hope I can learn through your advice Grant. Thanks again, soda