I got PF the first time when I was over 200 pounds about 15 years ago. I was also using worn shoes and I think that contributed to the problem.
I got rid of the problem with night splints, stretching, aftermarket insoles and losing a lot of weight. I may get a twinge once every two years or so but I can just amp up my stretching to get rid of it.
4 x IG Prestige MP, 70 cm, 376 grams, 386 SW, ALU Power @54, Prince Syn Gut 16 @58