yes I am using #219 chain.......perhaps this is why I'm finding the 16 driver is a little slower on dyno acelleration time, like you say, a little small.
Love the previous thread on the matter......7 pages of bashing away with Alvin and his 2-strokes, I could think of nothing worse!......a very interesting read though B-)
On my dyno I can plot and overlay curves of angular acceleration in Rad/sec^2......with the 20:80 ratio, its a no brainer, it gives noticably more angular acceleration at the bottom end, around 3000rpm than the 16:64 ever does......at the top-end, its the same......hence I'm taking a sabbatical for a while regarding the 16T, and will use a 19T driver for the rest of this year.