Your SMART test looks decent. Drive hours are getting up there a bit and you have Raid-Z1 VDEVs so you can only have a single drive failure per VDEV or you lose the entire pool.
Your set up has a bit more complication with cables and MD1200 and you didn’t mention the HBA and if it was a plain HBA, flashed to IT Mode or RAID. I hope not on the RAID. Make sure all drive models are CMR and not SMR types for recording tech.
Do you have regular SMART Long tests scheduled? You can also consider setting up and running the Multi Report that a lot of users run.