Changing profile CdA, what do I hold?

[pb21]

I have a profile that has been set using the check calibration analysis following an out and back ride with a set CdA value (0.29, TT Bike position).

If I now want to 'tweak' the profiles CdA from 0.29 to 0.27, as I think it may have been set too high during the out and back ride, should I hold the 'Aero' value, the 'Wind scaling' value or does it not matter? Everything else remains the same.

Thanks