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Interesting. For me PF gets worse when I walk more. Even with special soles. Still trying to figure out what works.
Constantly stretching the heel in two ways works well for me, both to cute it and prevent it in the future. The first is hanging your heels off a step and letting them stretch down, both with straight legs and bent knees (one foot at a time). The second is putting your heel as close to a wall as possible, with toes on the wall. Both work better with sneakers on.
Stretching and rolling with a small foam roll helps me as well.