RHM Pitch and Roll filter problem

[W.Fox]

I wanted to try RHM instead of the ingame Lock to Horizon setting as it works in a better way. But for some reason, its not filtering everything smooth enough, it makes me motion sick after some minutes. This is because, unlike the ingame option, the track isnt steady as it should be with RHM, it flickers and vibrates as soon as i go over kerbs/bumps/grass, archieving the exact opposite of what it should do. The ingame option Lock to horizon is disabled while testing RHM. Can anyone help? The ingame option does the filtering perfectly but it also adds the unnecessary camera movement, thats why im interested in RHM