Is that you on the bike in the pic? Can't really say from the pic, but is your saddle too low and too far back? I climb hills in my saddle and do best when in the drops. I also am pedaling a cadence in the 80 - 90 rpm range when I do them at my best effort. Not saying I'm great at it, but I'm not shabby either.
How is your speed coming into the hill? If your group gets bunched up going into the start of the climb and you are at the rear and have to slow down for that, then you'll spend a lot of energy just trying to accelerate back to the speed you had before it bled off.