If you weren't using MSI AB to load any profiles that changed the card's clocks or voltages, the most likely cause for the instability would be it's polling of temp sensors and such. You may want to mess with the "compatibility properties" settings, or shut down other applications that could be trying to monitor the same things.
yes, I also took your advice and lowered the SS. Speaking of that, is anti-aliasing and supersampling related? If so, which AA setting is preferred? FXAA, SMAA or MLAA2-4?
ED, like most applications that use differed shading, does not support conventional MSAA (multisampling anti-aliasing), so that leaves supersampling (rendering at a higher internal resolution then scalling to the output resolution, which is the best, but by far slowest way to reduce jaggies), or various post-processing AA filters (FXAA, MLAA, SMAA, etc).
Depending on what your display's native resolution is, and your desired frame rate target, you may or may not want to run supersampling, but a 2080 Ti can handle up to about 5k without dipping below 60 fps, so if you are on a lower resolution display, you can probably get away with considerable levels of supersampling (which in ED is a multiplier of the linear resolution values...eg if you have a 1080p display 2x supersampling will be 3840*2160 internal resolution, or 4k).
Unless you don't like the effect, I almost always recommend SMAA for the actual 'anti-aliasing' setting in-game. It generally looks the best and doesn't perform any worse than the other filters. FXAA tends to blur stuff too much, while the MLAA settings tend to be worse at mitigating jaggies while still being slower than SMAA.