Rather than dropping down to the reservoir from the cabin, I’d carry on over the bridge and across Middle Moor, which is an ace bit of trail – watch out for the new obstacles placed by the trail police across some alternative lines, which are going to break someone in the dark one of these days – then up to the Monk’s Road either on the road (dull and iffy) or up the parallel permissive footpath, safer but technically naughty, then back over to Hayfield via several options.
I’d also ride the main bit of the loop the other way round, but opinions vary on that. Its good either way fwiw, but Rushup Edge in descent is now a bit rubbish. YMMV, but probably not there to be realistic…