Don’t mean to nitpick but… if you are flying at any FL and do an approach into KSFO, taxi to the gate, unload your passengers and reload for a return leg, enter your new flight plan, get your clearance, taxi out, depart and climb back to same FL, I am betting that a bit more than 15 minutes have gone by.
In the time it takes to turn around a commercial flight there could be frontal system hit the airport and move on before you even get a chance to push back. I have conducted real flights where I bucked a head wind in both directions. I would hesitate to say the wind was “nerfed”, but, trust me when I say, my luck was definitely “nerfed”!
The only way to test your theory would be to turn around in flight to see what your tailwind is.