That's my head banging against the wall. I'm trying to find a nice edge finish for my knit top with my ancient serger. It's just not cooperating as well as I'd like. I think I'll just do a 4-thread seam finish. My rolled hem just wasn't looking right with the fabric wanting to curl over once it was done. Kind of like pane velvet when you cut it. Even a flat edge didn't look that nice.
Tinkering with my settings with the 4-thread regular seam finish looked clean and the fabric behaved nicely with it. And when the stars are in alignment with my serger, the finish looks professional. It took those stars about 90 minutes to get there though. Swearing under my breath while doing it, "It's time to get a new serger!"