I made a copy of the Automatic Profile with the slider set to highest performance and started tweaking settings from there. If you hover over each setting, it tells you what it does. If you can't use RIFE then my current SVP settings wont work for you. I recommend running the SVP performance check, making a copy of that Automatic profile and trying each setting to see what difference it makes.
You could also try just running LSFG on its own with a x2 multiplier to get 48fps which for me was smoother than running at 24fps. LSFG is much lighter on the GPU but it also has the same (or sometimes worse) artifacts as RIFE which is the downside. A discussion with @RickyAstle98 about my SVP settings, RIFE and LSFG are in here:https://www.svp-team.com/forum/viewtopic.php?id=7904. He uses LSFG with SVP Rife which you can't do, but it enables use of a higher fps with RIFE. So maybe you can also use LSFG with just SVP (no RIFE) to get the best overall results.
I also posted some settings in the main RIFE discussion thread which you could also try. But they use nvof and require a pretty decent GPU.