Hmm, in that case, check that your cable adjuster isn't adjusted with too much tension and preventing the FD going back to the low limit screw location. If that isn't the case, maybe relax the low limit screw a bit. This is of course assuming the derailler height and alignment is correct...

Honestly, I love my SRAM equipment, but their FD's are a bit picky to set up. Haven't run Shimano 10sp to compare, but I've never had the trouble with my older 7 (or less) speed FD's. I will say that once I got my SRAM FD's set, they don't miss a beat though.