I confess I don't know what FEEL or an Etron RGB 201 RXi are, but this issue is probably due to an issue with interlaced modes. The image jiggles up-and-down, rapidly? I get this on my arcade monitors - the fix is to edit the interlaced modelines in Arcade OSD, and increase the V Total (I think it is - I will check and report back) . Just keep increasing it a bit, until the image is stable. Note that to do this for the Windows desktop mode, you will first have to set it to another mode, adjust and save, then switch back to that mode as your desktop default.
Edit: Yep, it is V total that needs adjusting (assuming you have the same issue as me).