I have not been able to get my 16.5 # Claw anchor to self launch from my BRM-4 anchor roller. I know that you should use the Delta # 14 or the 22 # Claw type anchor for the BRM-4 in order for it to self launch but i do not know which one to buy.Is the 22 # Claw over kill... and... the 14 # Delta doesn't seem to me that it would grab ( set ) in a hard rocky bottom. Need any suggestions on which one to buy. Thanks Tug