Removing nfsver=3 doesn’t seem to make any difference unfortunately (“sudo mount -a” still gives no errors, but end up with same “no such device” result)
EDIT: I removed the nfsver=3. Add it back if needed.
EDIT2: You may also want to add the options user and rw (user == allow user to mount, rw == read/write access). Also, while I don’t think it’s required, add 0 0 to the end of the line.
This works perfectly! Thanks so much really appreciate the quick and really helpful responses.
I’ve edited my original post (also correctly the typo dill pointed out), just in case of use to any other newbie - as this completely fixes the stuttering issue I’d been having for 4k files.