Awesome, sounds like I should give this a go then! I guess using tps limit would prevent those 403’s by sacrificing a little of the scanning speed.
-edit- have just changed over to this now. Performance looks great, and hopefully no bans. Looks like that dir cache option listed here New Feature: vfs-read-chunk-size actually was what I wanted in the first place. Seems to cache directories and nothing else, which is perfect.