On which version of OSMC are you? You’re running a Vero 4K+ right?
I’m on a nightly build from around the end of January and as stated above the stuttering issues with 4K material is pretty much gone for me (well excpet for the occasional hiccup which can be fixed by skipping back 10 seconds).
I remember the pink/green issue you describe with some old versions of hyperion and hyperion.ng and on the odroid c2 - on the Vero this is a thing of the past for me (hope it stays that way 
)
cheers
Anthrax