What prowess? It is the truth, size isn't an issue here. It is what you are doing with the "tool" that matters first. Not being able to erect the DSMB because it is too big for you or for the purpose, is an issue that can have serious issues on the safety of the diver. The insistence of the OP on this inappropriate size just because he wants a bigger DSMB than anyone else's is just unreasonable and potentially dangerous.