Original VS doesn't take much time to break in, just let the racquet sit for 24 hours before playing it. I don't really notice any stiffness and it plays so nice. I hate the new BT7 which in my opinion is way stiffer that you might as well just play with a soft multi and save yourself some money. I think they did it to lower the cost which I would have preferred them raising the price of the original VS instead.
Wilson natural gut is pretty close to the original VS probably about 95% of the playability of the original VS. I only have a few remaining sets of the original VS so I usually string it up once every few months just to remind myself what it feels like to hit with it.