Your primary goal is to cure the ADS. So for now that’s where you want to put almost all of your time and energy. It is going to give the best long term results. Something to understand about stock training plans like the one I wrote in TftNA is that it is a one size fits all type of program meaning that it is not idealized for any one person. You understand what you need and are seeing good gains. Adding Z3 intensity right now will just mean less time for the Z2 work you really need. It can even blunt the aerobic development (depending on volume of aerobic base training (Z2). Too keep some power in your legs you might try adding a hill sprint workout each week. Be sure to take plenty of rest between sprints.