cmack... never paddled the rocker. I demoed a proto small villain, and it felt like a sporty creekboat at my weight. Nice boat, but I definitely wanted more volume. I don't think the villain is too big at all. Its got the volume to keep you on the surface, but feels pretty damn nimble considering the size. Its easier to turn the the nomad 8.5 and less prone to spinning out than the grande. Best bet is to demo one and check it out. Don't think you would have a problem in the boat at 6'.
As for the villain increasing swim percentage... gonna have to get enough days in the boat before I can comment on that. I think my swim % will go down from el tippy grande... With that said, I have been out of the villain already. I can say that the villain wet exits like a charm, is very stable to hold on to when you are out of your boat grasping to self rescue your shit, and has a nice centered drain plug to empty all of the water out of your boat. Another check mark for the villain... does great in a swim. Ha!