Back when I was developing the Redpoint Turntable with Peter, we had terrible static issues in the Winter. The solution for our designs may be relevant to you.
We grounded the bearing to the phono stage (any earth ground will do). You might not expect a bearing whose only electrical path from the platter surface to ground is the capacitive coupling between the bearing spindle and body (a distance on the order of .0001", separated by lubricant), but it does.
Obviously, there are two approaches to this problem: (1) keeping static from being generated, and (2) draining it to ground. Either one or both are viable solutions. I don’t want static production to dictate my record to platter interface, so I prefer option 2. Anyone who has experimented with the sonic effects of different mats (and their effect on energy transfer) will understand why.
I rebuild Fender Telecasters as a diversion, and I’ve found that some pickguard materials generate quite a bit static. Irrespective of whether I shield the pickup cavities, I’ll use some conductive foil under the pickguard to connect it to ground. Problem solved.
... Thom @ Galibier Design