[komplex]

EDIT: -It Seems that if the file is a 1080p, it will actually append the 'p' at the end of the $R. So it will make a the $Rp = '1080pp'
But if the file is a 2160p, it does not append the 'p' with the $Rp. By doing what you suggest, all my files that are 1080, are labeled as '1080pp' now.

The only thing I can think of is to set everything back using $T ($Y) then set it to $T ($Y)-$R and select only your 4k movies and run the renamer then go back and set it to $T ($Y)-$Rp and select everything but your 4k movies and rerun the renamer. See if that helps