The take off perf also considers tail wind if you used that table that is.
If your using a runway that has a headwind then all of a sudden it changes to a strong tail wind on take off I personally would consider that as windshear.
Boeing state that adjustments to get the target N1 should be made before 60kts. If you do decide to advance the throttles forward to get 26k your Vspeeds will be invalid.