The best tool for testing Curve Optimiser settings for low load / transient load stability is Core Cycler.
https://github.com/sp00n/corecycler
More information from its creator here;
https://www.overclock.net/threads/corecycler-tool-for-testing-curve-optimizer-settings.1777398/
It's basically a tool that cycles Prime95 between single individual cores, and also intermittently pauses and unpauses the workload so that the CPU gets some idle time, and also lots of transient loads. I've used it extensively, and it's been great at detecting errors.
It's also really good at logging what it's doing, so if you come back after running it to find your PC has crashed and rebooted, you'll be able to see in the logs which core it was testing when it failed.
I can appreciate that it's not sensible to trust software from an unknown source, and on these forums I am an unknown user. Generally I only read the articles on Tom's Hardware and don't use the forums, but I have been an active user on overclock.net since 2005, if that counts for anything.