5706X Anita Care Tonya Post Mastectomy Padded Bra

I measure a 30G and have struggled to find a mastectomy bra in my size, so was advised to buy a 32E instead as 'it's the sister size and comes up the same'. This bra is heavily padded which is not what I would normally wear, but on trying on seemed comfy enough which is the main concern following an operation. After a few hours of wear though I struggled with 1) chaffing in both armpits as the cup comes up so high under the arms, 2) my remaining boob was not held in by the shaping and was therefore moving around into the other cup giving me a really unpleasant shaped monoboob and considerable discomfort. In addition the bra is so heavily padded and moulded that it gives you a really unnatural shape. I was extremely disappointed with this purchase and am still trying to find something that is suitable for me to wear following my mastectomy. Why do lingerie companies, even specialists in mastectomy and post operative products not manufacture bras for people who are lucky enough to be slim but busty?