Try disabling SLI and seeing if your FPS changes?
I don't even know if nVidia have released an official driver supporting Odyssey yet for SLI and the likes, as it's sort of a different game with a different shader makeup it might not be working correctly? It could be just how it is of course, but worth looking.
AMD RYZEN 5 5600X 6 core AMD RADEON RX6900 XT 32gb RAM on ULTRA ULTRA WIDE SCREEN SAMSUNG. It works like a charm

so..you should check your rig or your settings..P.S I play on ULTRA. I am disgusted with the level of your uneducated information...
Congratulations on having the current world's 2nd fastest GPU and using this opportunity to brag about it, that isn't really constructive for the situation at hand. I'm disgusted by your attitude and level of uneducated information regarding performance differences in the graphics cards in question. Your GPU is what, 50-70% faster than OP's?
@OP. Unfortunately if we want ED to "keep up" with modern titles, the day would eventually come where older hardware wouldn't perform as happily as it did on Horizons. More optimisations will happen over time, as will assistance from graphics card drivers. Even more unfortunately, the timing of this release is where the world is in a bad situation with the hardware we require, so people can't simply go out and purchase a decent mid-range+ GPU for a reasonable amount to assist.
I'd suggest turning down Ambient Occlusion, AA, Shadow Quality, Bloom to High (though it still doesn't appear to work..) and just things that won't hamper your immersion too much, to get the best Quality/Performance ratio for now. There are seldom vast differences between certain settings like Textures on Ultra Vs High, so dropping down a setting everywhere should give you some performance back while not impacting your visuals too much.
FWIW, in-ship framerate will be a decent amount higher than on-foot, unless you go planet-side of course. Apart from where lots of fauna/people are, the frames should be similar to the tutorial.