Difficult to answer this without you in front of me but lets hear all the following.
How much do you weigh? 15stone 10, 6ft 2.
What is your stance width. (not sure on this) I’m left foot forward
What angles are you riding (please tell me you’re not duck). All my friends ride both angled out however I like straight back and slight angle on the front
Are you putting your weight more on the front foot on the piste as opposed to rear in powder.
Are your knees bent sufficiently are you moving the weight impression toe to heel, rail to rail or just standing there letting it hppen?
Where exactly is the pain in your feet? Arches kill like crazy
Lots for you to consider and echo getting someone good to ride with you, be worth going to chamonix and having a days guiding with neil (macnab)