So maybe I'm just retarded and am not getting this. Basically what I don't get is whether or not the SL-R is a twin or not. SO basically, the Evo is the same tail and nose length, so you have a centered stance. But then the pop is also twin on the Evo? But not on the SL-R. I guess I don't get the difference between twin and directional, and how it applies to these two boards.