Chain rubbing against the mech cage?

I have a double chainset and 8 speed cassette.
When using the small chain ring and the 4 smallest sprockets, the chain rubs against the mech cage on the front derailleur. As I understand it, I should expect a certain amount when/if using the smallest 2, but surely not the smallest 4?

Try this http://www.parktool.com/repair/byregion.asp?catid=53

1) Maybe you shouldn't cross chain.
2) Can you trim your FD?
Or possibly 3) Poorly adjusted derailleurs/gears.

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Morphed Bianchi Camaleonte IV 2006, Ridley Damocles 2006, Garmin, Mac