in FACT on the nail old chap. Now one seems to be helping so I'll bite I'm a B737 pilot.
Exactly as you put it. If you are landing autothrottle OFF or speed deselected i.e in ARM then in the case where there is no gust additive component to the fly Vapp to the threshold and bleed off the speed to Vref+5 in the flare from 27ft.
I wouldn't assume the additive is also positive. In some of the IGW versions of the 700 and the SFP versions of the 800 I think you may find that they have an increased FCOM/AFM limit allowing you to accept up to a 15kts tailwind on touchdown. So be careful with the calculation especially if FACT is indeed your location as airports in this continent don't like to change runways unless they absolutely have to. I recently heard an Arik B737 at ABV complaining about the 25kts TW they had on final to 22 @ ABV to be told it was ok as another B737 had just landed
