Yeah, the tailwind certainly makes it easier to go a given speed. The thing is that max power is max power no matter how fast you're going. The big difference with the tailwind is that it allows you to accelerate more, and rapidly increase your cadence, and I believe that this allows the gearing to help with your dwindling power during the sprint. Work on your timing and rhythm.
Also, test for 7", not 5. You don't want to miss the good samples.