I have noticed many sports bras that have internal moulded shapes that can be removed. Also things like aah bras...that can be bought now at chain stores sometimes have padding in. This means you could put soft additional padding in the pocket. Did you get a soft prostheses form with your berlei bra? There are also knitted knockers...just light forms that can go in a bra and I read on here a lady who used a sock and filled it with rice as it was much lighter. I know you feel self conscious but do go to the yoga class....remember those ladies do know and are probably experiencing something similar. Keep trying until something feels right for you.