Sounds to me like you’ve ridden it all already, there’s not much else up there as far as I know (after 10 years in Marsden).
The only really ridable way up is the incline past the railway chimneys. The best descent heads from the top of this over the moor towards the village to the square chimney, then down past the wooden cross and left at an old gate post on a tiny sheep track.
All the ways up and down from the village side require hopping over stiles or through farmyards, and are a bit crap on a bike anyway. The path that runs from the top of Mount Road parallel to the A62 is OK, mostly, but doesn’t really go anywhere useful.