Can you estimate your ankle dorsiflexion past 90 degrees? Are both feet affected, or just one? Is there a side-to-side difference in the amount of dorsiflexion you have?
Do you have any hip tightness? External/internal rotation deficits? Any asymmetries?
Are you doing any foam rolling or self-myofascial release on your calves?
Do you lift any weights? My own PF seemed to resolve more quickly once I started squatting and deadlifting. In my case, I think I had some severe strength deficits that were contributing to excess strain on the structure of the foot.
For your achilles tendon: are you doing any eccentric calf raises? Those seemed to help me when I had an AT problem.
Finally: my own ankle dorsiflexion issues did not improve at all until I started these two protocols as explained by Bill Hartman: mobilization with strap (KStar has a similar one on mobilitywod but with a band -- I prefer the strap), and miscellaneous soft tissue and mobilizations. The one with the strap was especially helpful for me -- may not be the case with you, depending on the source of your dorsiflexion issues. But it's worth a shot.
Best of luck. PF is a bitch.