Try building some mini-dead rats (Rykote make a better version)- they do work to cut wind noise by around 80-90% - obviously, record in heavy wind, and they're going to be useless. Note you will lose some top-end.
Omni caps will be better in wind.
Here's some I made earlier, for the slightly larger AT831. They are designed to operate over the stock windscreen. Elastic loops are not shown, but are used to secure the dead rats to the mics:
(outside)
(inside)
Edit for giggles: