Been there.
The PF is part of the calf muscle. Can't emphasize stretching enough.
You'll have to experiment with different shoes/no shoes.
I use Specialized Blue inserts in my cycling shoes.
I wear Keen Targhee shoes.
I live in Florida, so I do a lot of barefoot.
These sandals are cheap and have great arch support:
Mens Eurosport Sandals | Essential Collection | Okabashi Shoes
Stretch that calf and keep it stretched, without stressing it, of course.
Good luck.
S