I was having a serious issue with stringing with SFACT. The problem turned out to be insufficient filament retraction on moves, though I never solved the problem there despite a lot of fiddling with the settings. SFACT tries to hide the "complicated" settings behind a couple of other things and presumably uses its own algorithm to figure out the optimal setting.
In desperation I tried "Slic3r" which is a skeinforge replacement. It solved the problem immediately, but is not currently a viable replacement for Skeinforge due to many features not yet implemented.
In the end I decided that I should just break down and learn to use full Skeinforge. That worked fine too. My settings are, minimum distance after retract, 2mm, retract distance 3mm, retract speed 40mm/second (though that is limited by firmware)
slic3r on left, SFACT on right
There are still some troubles there, for which "cool" needs to be activated (Slic3r has no cool function currently).