Fellows - I was not advocating flying at Vref+20 per se, and as always, headwind component is ideally bled off approaching touchdown and gust factor maintained (according to 'judgement', of course). I feel sure that the 'limit' of 20kts that Boeing certainly publish is based partly on the 'historic' BCAR figure and also on the practicality of eliminating excessive speed in the last stages. Given that touchdown is ideally conducted at whatever 'Vref' is chosen (-5), as modified by 'factors' and that 100% of the headwind (ie twice your chosen additive) is reducing your LDR , I am pretty sure the system is fine and workable. Should you happen to have added 40kts for a 40kt gust factor and it is 'not there', it may not be your day, but isn't that life? Surely better that than to drop heavily out of the sky with a 40kt speed loss in the flare?