Hi IceDreamer,
afaik there are no 'perfect' settings for SVP. There are several types of artifacts and more smoothness usually means more artifacts. My personal favorite settings are:
24p -> 48p
Grid 14px. Average 1
Decrease Grid step by 3-4 (very expensive, possibly only placebo)
Search radius small
Artifact masking weak
The rest is default.
Thanks for your support on FAF btw!