SiAli Sorry for the late reply; I've been away from the forums for a couple days.
If you want to try DirectX 9 mode, it's a check box in the graphics options, in the lower-right corner. I don't know whether it would be affected, but there are definitely a few issues with DX11 mode that don't show up in DX9 mode.
Other than that, do you have an Nvidia graphics card? If so, you might have success telling the GPU to render the game at a higher resolution through DSR (dynamic super resolution). I don't know whether it'll work, but you could apply the setting in the Nvidia Control Panel, maybe in the Nvidia App as well. 1.78x translates to 2560x1440 on a 1080p screen; 4x is 3840x2160. You would of course be playing at a lower resolution than that due to the docking, but it might get you above the threshold where the cursor is misaligned.
If you have the Nvidia Control Panel, right-click the desktop, select the CP, choose Manage 3D Settings > Program Settings, find ts4_x64 on the list, and choose the DSR setting you want to use. If you use DirectX 9 mode, choose ts4_dx9_x64; ts4_x64_fpb is for the Memory Boost version.