I'd definitely recommend considering a compact double crankset if the 39/27 combo is not low enough for you to spin up hills - it wouldn't be for me either! I have a compact 34-50 in front, and Campy 13-29 in back, and even with my low gear of 34/29, I have occasionally wanted one or two lower gears on really steep climbs. You could also consider a triple crankset for an even lower low gear (most triples have a 30 tooth granny gear), but that will require a new bottom bracket and possibly a front derailleur change. Consult your LBS and save your knees!
Emily
P.S. You're also correct in thinking that having to twist out of your clipless pedals with a lot of force can hurt your knees. Might want to look into some easy-release pedals like Speedplay X-series, Frogs, or Eggbeaters. I am sure there are many others, but those are the ones I am familiar with.



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