Hey JO I had no idea about the cbd's in the fans and stems! Wow that is very enlightening. Thanks for that I'm gonna read up on that.
10 filters isn't overkill on the amount of material I run in my tubes especially because of the surface area of material exposed to the filter surface. I run between 200-300 grams per tube. It all depends on your tube size and pressure build up and what you can see coming out of your tube in your tane through a microscope.
The size of the tube, the amount of material ran, and the amount of tane ran through the filters will dictate how many filters should be used for what the extractor is doing.
Fine ground material will also require more filters vs course ground or broken up buds.