Speaking of "dry" or "wet" footprints (have a dry one!), do not be surprised by the location of the ETPS. At cruise, you could this time of year have a strong headwind, but the depressurized ETP is pretty close to the geographic mid-point. At FL 100, the wind will change to a tail wind of 20 knots or more as you enter the tradewind latitudes, about 28N, which is about halfway.
GF