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I wouldn't set recordsize so small on a modern system, I left mine at 1M for a system that can store anything from small config files to full movies. Also set dedup=off (I can't remember why now, but I believe it was bad to turn it on when your drive is nearly full?). Another option you might want to look at is xattr, I set this to 'sa' for all my systems because a lot of program use those features now. All of my pools are set up as raid-z2 or mirror, but zfs is an awesome filesys for protecting the integrity of your files.
Otherwise it looks pretty good? Keep an eye on "zpool status" for any bad drives in your pool(s), and hopefully your system added a cron job to scrub your pools once a month.
Dedup is apparently very very resource intensive and not worth the load unless you're expecting 5x+ reductions in space usage
Probably depends though
Oh, for some reason I thought the reason to remove it was that it limited or broke some of the built-in sanity checking to maintain data integrity. I do remember reading in a number of places that it absolutely should be turned off at all times, but it's been awhile since I set up a new zfs pool so I was just going off my notes of what settings I use (and confirmed I still used those on all the current pools).