Personally i never started to get any real improvements until i dropped my milage.. .a lot more than i'd thought . I went from 50miles per week down to 2-3miles every other day.

I found that i would always get to 20mins before getting pain, so i started to run for 15mins.
I also found that sleeping in a plantar boot helped. even though i never had problems with my plantar region. as silly as it sounds, i was finding the weight and pressure on the duvet was causing my foot to flex meaning that for most of the night my tendon was healing with it in a shortend position.

I also found cycling really helped as it didnt hurt but also kept the area mobile.

In the end id say it took a good couple of months of rehab. Ok so i was running in the time, but only a couple of miles at a time.
Sorry i cant give you any more help.