About WMS and the need for more wind protection...
Frustrated with the WMS foam on M/S CMBIs in even light wind, I just ordered 2 fur-style windscreens from thewindcutter.com; no experience with them as of yet, eagerly waiting. They have 4 versions, variable hair length, presumably withstanding from low to high wind. The WMS foam dimensions are diameter 72mm and length 60mm. I bought a measuring tool only for this :-)
About other ways I've explored:
Unfortunately WMS foam is smaller than the smaller Schoeps baskets (smallest Schoeps basket I think is 150mm diameter IIRC), so third-party fur-style windscreens for Schoeps baskets (e.g. Rycote) wouldn't work on WMS, I suppose.
Schoeps was kind enough (thanks!) to offer advice about Schoeps and Rycote windscreens - all are baskets. Unfortunately they'd make inaccessible the on/off/attenuate switches on the CMBIs - imagine removing the fur and open the basket only to turn a switch, not feasible for me.
I do think this basket advice is very pertinent for Actives (not CMBIs), which seems to be your case.
My current conclusion is that thewindcutter.com is the only strong wind solution for WMS on CMBI M/S... and I would love to learn about other possibilities, especially from Schoeps if they ever make one.
(not affiliated with thewindcutter.com, no particular interest).