Before you do ANYTHING....
Try one dive with shoulderstraps so loose that you kan get a fist between your suit and the straps, and a properly fastened waistband WITH the crotchstrap.
Most likely your issues comes from too tight shoulder bands. As long as you have fastened your waistband and keep the crotchstrap, the BPW will be stable enough and you will have plenty room to get out.
Try one dive with shoulderstraps so loose that you kan get a fist between your suit and the straps, and a properly fastened waistband WITH the crotchstrap.
Most likely your issues comes from too tight shoulder bands. As long as you have fastened your waistband and keep the crotchstrap, the BPW will be stable enough and you will have plenty room to get out.