For the non stop 15m/s weather issue, if you patch the game with H.sie patch + Stiebler patch on top, weather is just fine, even better than SH5!
It always change from clear to partial cloudy to overcast, with or without rain, but most of all wind is always changing and never get stuck on 15m/s anymore
When visibility is reduced, you even are warning on any TC...that’s quite fantastic IMHO.
It’s to me the best weather i’ve Encountered in any SH, modded or not.
As said above, it has nothing to do with GWX.