How is folding the edge prevented?

Spline: Keep the spline on the leather.
Speed: How slow can we go before it isn't stropping?

Any other tips?

I think I may have rolled my edge. I don't have the natural knack for stropping, so I see this frequently happening for a while. I'm considering getting myself a finishing stone. I'm also thinking of forgoing stropping because I can't afford to replace my strops when I scrape them with a rolled edge.