Firstly, Why are ATC insisting that you use a runway with an excessive TWC?
Secondly V ref + calculations are predicated on the HWC of the wind. eg a 90deg x wind at 20 kts HWC nil therefore Vref +5 any gusts would cause additions. But the question remains that landing with a gusting TWC is setting yourself up for a rather unnecessary incident. Insist that the runway is changed
