My biggest takeaway so far with the new plan is how helpful leg workouts in the gym have been after my harder runs. I've scheduled them there thinking that I wanted fresh legs for my main run workouts and would rather have a good run than a good gym workout. Piling all my hard leg work on just a few days lets me recover as well on off days. But I've had a surprising revelation and that happened when I persisted with my gym workout even when my groin and hip (my usual area of weakness) were mildly sore from the run. I don't go crazy in the gym lifting heavy weights. Most exercises are body weight or resistance and focus on my glutes and leg muscles not heavily used while running. But interestingly my soreness disappears during the gym workout and never returns afterward. I think it's likely I'm just thoroughly stretching as a result of the post run workout, but it's not typically what I'd expect to happen. A nice side benefit.
On a less upbeat note during tempo runs I've not really regained my ease of speed I had last spring. Even marathon pace requires more effort than I'd like but I am old and wise enough to know that's not a concern this early in a training cycle. It will get easier.
So far so good, another update in a few weeks.