I'd also suggest that using air dried instead of kiln dried wood seems to produce more fuzzies to be cleaned up.
I made 25 Halloween signs for a craft show(that better sell this week!) out of air dried poplar, pine and oak. They all seemed to need a good bit more time on the sanding mop. I changed to a new carving bit halfway through and it didn't make a significant difference. Best quality helped a little, but I'm sticking to my opinion
To invent, you need a good imagination and a pile of junk.
Thomas A. Edison