I grabbed the Miller mask, https://www.millerwelds.com/safety/respiratory/half-mask-respirators-m00469#!/?product-options-title=lpr-100-half-mask-respirator-m-l-ml00895
Seems to do the trick pretty good. No headaches, no black boogers. 
I do have a fan blowing outside (even in the winter), but it doesn’t keep my shop from getting pretty smoky/cloudy after a couple of hours of cutting. There’s a layer of yuck on everything… I’m shopping for a fume extractor to try to eliminate that.
-Ben