A wind gust correct normally applies to the approach and then only before the threshold. Remember that the wind profile and gust characteristics vary with altitude, generally reducing the closer you are to the ground.
Takeoff V speeds are performance speeds which must be followed accurately in the event of an engine failure. There are safety margins within these speeds but not as great as the margin on Vref for landing (never more than +15 at the threshold, and then only with an accurate touchdown point). The takeoff speeds safety margin is to cover your flying errors and stall protection, not for additives.