I would consider replacing your tent with a tarp. You can buy very nice tarps weighting around 1lb or less and capable of sitting entirely in the outer pocket of your Gossamer Gear G4 (how do I know it... I own one too).

If you're camping in an totally tree-less are, then you'd need to add at least 1 hiking pole to your setup, but if you could be sure you'd find at least 1 tree - you wouldn't need no extra poles, just some longer rope to tie-out 1 end of your tarp to it (and stake the rest of the tarp to the ground).