In my humble opinion, even taking nil wind for a reported 15kt HW seems a bit extreme. Remember performance already factors just 50% of HW component, yet 150% of a TW component. So your conservative calculation is already hugely taken care of before any pilot conservatism comes into play. Of course as mentioned above there may be local variances/experience to consider but overall all things being standard I wouldn't have an issue taking the reported HW.
The issue that is more common to face is extreme conservatism with T/O performance, only to see the aircraft doing 4000fpm into a low SID level off because OPT has been tricked into thinking full T/O power was needed. Much better to take an intersection figure, reduce T/O power and use full length. Plenty of margin and you won't be setting off anyones TCAS!
Last edited by Starfox64; 17th Feb 2019 at 21:12.