Will do some testing over the weekend and report back. 
Using: Filtering->Vapoursynth->Othe->Frame Interpolation->MVToolsFPS with 'Target fps 120', 'Blocksize 4' and 'Method FlowFPS' looks better in regard of the artifacts while the bike is in front of the wall, but looks worse when the bike is close.
Found no clear 'winner' for this sofar.
AvisynthOptimizer (see: https://forum.doom9.org/showthread.php?t=175723) might be worth a try. (never used it sofar myself)
Cu Selur
Using: Filtering->Vapoursynth->Othe->Frame Interpolation->MVToolsFPS with 'Target fps 120', 'Blocksize 4' and 'Method FlowFPS' looks better in regard of the artifacts while the bike is in front of the wall, but looks worse when the bike is close.
Found no clear 'winner' for this sofar.
AvisynthOptimizer (see: https://forum.doom9.org/showthread.php?t=175723) might be worth a try. (never used it sofar myself)
Cu Selur
--- mainly offline 20.-26 of May ---