I fully agree.
A possible solution would be to lengthen the time interval, at a guess you could give them a subjective week without worrying about too much personality change, making it more possible for them to successfully write down everything important.
I'm still very worried about the morality of it, as I see it the resetting amounts to mass-murder.
I'm still very worried about the molarity of it
Absolutely. We need to add a few liters of solvent to get the concentration down to acceptable molarity.
Toy model of an upload-based AI that doesn't seem to suffer too many of the usual flaws:
Find an ethical smart scientist (a Gandhi-Einstein), upload them, and then run them at ultra high speed, with the mission of taking over the world/bringing friendliness to it. Every hour of subjective time, they get reset to their initial specifications. They can pass any information to their resetted version (limiting the format of that info to a virtual book or library, rather than anything more complicated).