I’ve not tried any of the Pedal North site, didn’t know it existed. I will be though, looks like there’s some good routes on there.
I’ve done the Levisham loop from the MTB routes site, it does get very boggy up near Fylingdales which isn’t pleasant after the slog up the hill from Goathland. I have a vivid memory of repeatedly sinking up to my rotors up there once, I spat my dummy out and rode down the road to the pub instead 🙂
I received this as a secret santa present a few years ago http://www.sustrans.org.uk/shop/route-maps-guides/mountain-bike-trails-north-yorkshire it’s a great little book for ideas. The maps can be a little small for the bigger loops so I back them up with or mark them out on an OS map.