I am planning to buy a backplate and wing assembly soon. I see a few suppliers, like DSS offer backplates in various sizes, where as others like Halcyon, Dive Rite etc offer just one standard size. I expect there are savings for these companies by offering just a standard size, but for the diver, what is better? I am 6' 6" tall, do I need a longer backplate? What advantage do I gain by going to a longer plate?