RE: adding weight?
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So a correctly trimmed 2 pound electric park flyer will fly well in a 15 knot wind? I don't think so.
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At first I read this and thought what an over exaggerated example it is. But I thought about it more and the answer is a yes! A well set up and trimmed 2 lb airplane would fly better then a poorly set up and trimmed 2.5 lb airplane in a 15 knot wind. Again, the airplane sees wind as a change in airspeed. A poorly setup airplane will react to changes in airspeed so obviously it will react to wind. Ask yourself if your airplane's trim changes at all between 1/4 and full throttle. If the answer is yes then it is not trimmed correctly. Does it really matter? Not if you are happy with the overall performance.