Hi Norman,
What makes you think you got the PF from the shoes, simply the fact that they were too soft? I read on another forum someone saying the same thing that they fact they were so "squishy" they were actually not very good for long distance running.
I have quite a high arch AND i overpronate, not sure if this is normal but I dont think its common. I am currently living in the UAE and there is literally nobody in any shop / physio / podiatrist with any decent advice so I am trying figure this all out myself at the moment and finding it a bit overwhelming.
I intend to run my first marathon in January and if my next trainers screw me up then I dont fancy my chances in completing the marathon training which starts in September as I am currently out injured with something else at the moment.