Update for anyone who stumbles across this. I updated both of my samsung 980's at the same time using the ISO samsung provides booted off of a flash drive. This completely fixed the overheating issue for me, I haven't gotten a single warning in a few days when usually I get a few a week.
I did run mover first just in case but didn't bother to backup my dockers and took the risk. At first my dockers were broken after rebooting, but I ran mover again, and rebooted again, and they work fine. Seems like no data was lost, but if you have docker data you're not willing to lose then definitely back it up because that first reboot with them broken was a bit scary (they wouldn't launch, and said something about "image couldn't be deleted" if I remember correctly).
All in all, fairly painless, and very easy/quick.