I have to ask, if you have concerns about the weather reporting, "Why are you using Improved Climb"?
I'm not but I
could be if I needed to get extra weight: I don't want to base the performance on an incorrect assumption, namely the wind. We might be talking at cross purposes here but I don't see how using tailwind figures when you may not actually have one is in any way unsafe...
I can see the opposite, of course. It's a bit (only a bit, OK
) like using assumed temperature - fine to assume 30 when the OAT is 15 but not 15 when the OAT is 30...