Here is the story, I got a KM Kafae a couple of weeks ago and it came with a medium KM vase (Height: 11", inner diameter: 1 3/4") and it has been smoking fine since I got it.
Today, I've decided to try my old large vase (Height: 12", inner diameter: 2"), and there is a huge difference. Flavor is much stronger, heat management is easier and it is more stable.
Of course I am using more water with the large vase and I think it has something to do with the smoke being cooler and smoother.
Just wanted to share this with u