Hi Vad Guy,
this is my first post so bear with me. I hope your rehab is continuing to go well and that you are managing to stick with it. Neuroplasticity will occur, but it takes time and practice and effort. If your strides are still short, it might be worth having another look at what your pelvis and trunk mucles are doing. A quick way of checking is to do some high kneeling and four point kneeling work. If you collapse in a heap (on a soft surface hopefully) then it would suggest that some strength training in the whole hip/ trunk/ pelvis system might help. For ankle weakness and instability, do exactly what you would do to treat an ankle instability problem. Good luck and keep going.