Your really can't compare the weight of a single-walled tent (Double Rainbow) to a double-walled tent (Spitfire 2).
In the event of a driving rain on a cool windy day, closing the single-walled Double Rainbow would result in massive condensation problems. The double-walled Spitfire 2 with a full-length fly, even with all doors closed, still has substantial ventilation through the bottom of the rain fly and the hooded fly vent at the top.
Well, all I can do is suggest you try the Double Rainbow or one of the other TarpTents. Your prediction has not been my experience. I have, actually, slept very comfortably in my Double Rainbow on "a cold windy day" without a significantly larger amount of condensation than the double wall tents I own. In fact, the worst tent I ever owned for condensation was one of those double walled tents with the full mesh top - sleeping in that tent was like sleeping in a rain forest.
Again, 4 lbs is a pretty fair trade off for a bit more condensation.
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