It's the whole package. Don't sweat the wiggle. Once it's all laid with boards, or plywood, it's stiff enough. And isn't what makes a timber frame strong the fact that it can move a little? That's why the ancient temples and churches and ? stand for so long being exposed to earthquakes and hurricanes and ? They do move a little bit. And that's the beauty of it. My 2 cents. but I'm always learning.
dave