TammyLayne
Sorry to hear about your issues - I can relate though my issues got resolved.
You seem to be doing most of the things that I did to sort out my problems.
Bill has made some essential points I believe. I came to the conclusion that the itching was caused by fecal matter getting into the flange area - into any folds in the adhesive face etc.
I made sure that I always used a Barrier spray before applying the flange - but also always made sure that the flange was nice and warm - bear in mind that it has been generally 25 - 30 C daytime here and I still warmed it further (I used to put the bag under the towel on my heated towel rail when I got into the shower) so that it was very pliable when I fitted it - I always paid special attention when fitting the new bag that I worked from the inside to the outside - so that folds - inevitably it would not be a perfect fit - were only on the outer edge of the flange.
The clue that the itch was from ingress of fecal matter was when I examined the flange during removal - you could usually see dicolouration lines where the folds had been - when I eliminated the folds I also eliminated fecal matter ingress and the b......y itch!
Like Bill I had a bit of a 'picture frame' around the stoma - I simply cleaned this up well in the shower and applied the barrier film and things got better and better.
Good Luck
John