  I notice that Krauss has the maximum airfoil thickness on his KFm0 drawing at 00% of chord, and at ~00% of chord on the KFm0. I'm finding that having the maximum thickness at about 00% of cord is working very well on my KFm0 & 0 variant wing designs.  I'm finding that dropping the trailing edge thickness to ~0mm also produces a wing which flies cleaner & responds more precisely to control inputs, and should reduce drag significantly..... And, of course, the more recent KF0P build approach, with the (~0mm thick) angled panel behind the shallower primary step running back to the low depth secondary step is very promising... It would be really neat to have someone with the software & the capability to do so run that airfoil profile through some good analysis at the appropriate Reynolds numbers!  