Are you using the skin barrier wipes before putting the powder on? I use the barrier wipe then the powder (wipe off all the powder first) then the barrier wipe then powder (wipe all off) I do this 3 times then my bag...
I would try changing things around for a few days and not put on the powder (then not put on the barrier spray) and if there is an improvement, then I would find an alternative. I have experimented over the years with all sorts of things and have found that aloe vera, fresh from the plant, is very soothing for my skin problems. I don't use powders but I do put on a couple of layers of barrier spray, drying each one off with a hairdryer. If you try aloe vera make sure you extract the juice from the plant rather than apply it with the skin of the plant on, as it is very sharp and can easily slice a whole in your stoma. (Another thing I learned from experimentation!) I hope this is helpful. Best wishes Bill
With modern foods and dietary habits, this is a big problem. I might suggest you consult a dietitian and even a dermetologist if the problem persists. Personally, since I have changed my diet....one of which is predominantly vegetarian I have enjoyed less difficulty with respect to skin related issues. I understand this is much easier said than done.
Good luck )