X Foil seems to have a little trouble with sharp LE airfoils, I was only able to get it to run once. The one I did get to run had these weird pressure spikes up to max thickness, then a normal recovery; I think it had more to do with the way I was drawing the airfoil, it didn't come out exactly flat.

Anyways, X Foil also did not show the vortex forming on the LE, but then the vortex will probably be 3 dimensional in nature and X Foil is only a 2-D program, so that's not surprising. With that in mind, X Foil did predict an increasing Cl to about 0.8 at AoA = 3.5, then Cl decreased until 0.6 at AoA = 8, then Cl started going up again until about 1.25 at AoA = 13, and then decreased.

Interesting, but I think you need a true 3-D CFD program to really see what's going on here.