The shortest I rode was 172cm slingshot freestyle, its cool. However, I would mostly end up on its 115L big brother at 188cm, which is an awesome board. Currently I prefer my foilstyler at 199cm. I think it gets going earlier than the 115 freestyle because its longer and thinner and touchdowns seem easier to recover from.

I guess what I came here to say is that length is just one of the variables, strap, track geometry is far more important. And board shape will matter too