Thanks @gdodge!
Mask creation was certainly a lot of trial and error to get ones that worked well. The exact settings and mask shape/boundary will depend on each sample. My earlier post with input from @mmclean has more detail and also includes the link to the updated cryoSPARC tutorial page.
See the last few messages in this post: Masking out glycans - #12 by lizellelubbe
Hope this helps!