Svp bad looks problem

Those are known as artifacts.

To quote from SVP wiki:

https://www.svp-team.com/wiki/SVP:Profile

Actually, it's about profile setting.

The "optimal" setting which marked as "default" is from SVP Team.
Clearly your "default" setting doesn't give you what you prefer, so you tweak it to the point which the balance that you prefer.

I would suggest you to search around because this issue (the balance between smoothness and artifacts) already asked many times, nonetheless, the setting that you need to look out are:
1. Artifact masking, set that to higher value to mask the artifact, in exchange of smoothness.
2. Change the target framerate to be exact multiple integer of the frame rate, such as the target frame rate to 2x.
3. Decrease grid step, this refinement could help to filter the bad calculated vector motion, in exchange of heavier CPU usage.

There are many others, but those 3 could be the starting point before you tweak the profile further.
This page from SVP wiki should help you, https://www.svp-team.com/wiki/SVP:Profile

There will always be problems with the video in fast motion, if you want it smooth.
You only can get used to it.

Most things you could do had been mentioned.

I add this one:

Frames interpolation mode "Adaptive" is theoretically a good, compromise choise.
It switches between Uniform, 1m and 2m while the movie plays, depending on the scene.
It estaminates how badly the frames will interpolate and picks one of these 3 settings.

You could make "adaptive" gear down more agressive. If you want to experiement with that.

Go to the SVP folder (in a SVP 4, its in the script folder), find override.js
open it in an editor and find:

//smooth.scene.limits.m1        = 1600;
//smooth.scene.limits.m2        = 2800;
//smooth.scene.limits.scene        = 4000;

If you lower the first 2, you make "adaptive" gear down from Uniform to 1m and then to 2m more agressive.

EDIT:
Wait... Its said, the new SVP interpolates better then the old one. Means, you could also try that.

Yeah maybe, but what I meant with "always" is, "no matter how you fiddle with the settings of the current version of SVP, you will not get rid of artefacts"

"Always" in the sense of "with all existing setting combinations"

Now there is basicly: "get used to it or let it be."