Many thanks to everybody for your feedback and advice. I’ve increased my AeT to 135 and plan to retest in another couple of weeks. I am definitely starting to feel aerobically stronger and have to walk less to keep my HR <135. After almsot 9 weeks since starting my training, I ran a unplanned 5K for time on my Friday night run. While it wasn’t my goal when I first started out to test my 5K ability, I increased my tempo and it felt great to open up and I didn’t haven to stop due to muscle fatigue or inability to keep going. When I finished, I took almsot 5 min off my previous best 5K time and today I was almsot 4 min better on my 5mi time while staying in Z2 and below. It appears training is paying off and maybe I am starting to minimize my AED.