I am replacing the cable and adjusting my front derailer, and I noticed that I cannot set the front derailer to clear the chain when the rear is in it's largest sprocket as it wants to pull it off. I had noticed that the chain was rubbing against the rear derailer which is part of the reason for the adjustment.

Relevant details:
Bike avanti giro (2007 approx)
Shimano 105 CS5700 10 Speed Cassette Silver 11-25
Shimano 105 5600 Hollowtech II Compact Chainset Black 50/34 175mm
Shimano 105 CN5600 10-Speed Chain 116L
Fulcrum Racing 7 Clincher Road Bike Wheelset Black Shimano/SRAM

Any help as to where the problem could lie and how to fix it would be great.
Thanks
Barry