Good day!
Based on the quick test flight my setup with new RWC & SMP 3.1.1. & FSGRW runs fine...and produces amazing weather scenarios, and the actual weather changes are much, much smoother now. I am able to see weather fronts far away ahead or behind (to the horizon), pass them either side, fly through...and all that happens much more like in real life now.
So, it seems that RWC does what it is aimed for Naturally it takes some time to find your optimal SMP configuration. I have changed settings all the way around to see the effects. And all this goes on.
Cheers, and happy flying!