I've got my own little loop that i occasionally do from my house (You'll of passed mine while doing Arthur 2 Times) and i agree that theres quite a bit of tarmac desending. I don't ride up there that much as I don't find it that enjoyable - just farm tracks and country lanes.
That's the old 'Scouse Downhill' it used to be really busy every weekend with downhillers from all over the North West. The land owners and the riders had a really good go at trying to develop it, problem was it crossed a couple of bridleways and they couldn't sort out any really good alternatives to crossing them safely at speed. So a couple of years ago sections of it were bulldozed and it was closed down. However it had a happy ending as the landowners gave them some better land to develop instead >>
As for the Over The Top route it's a pretty hard route with plenty of climbing in it, but worth it for the views and the speed you can get up to on some of the sections, Moel Famau down to Gelllfor can get a bit mental. Not techy but a lot of people can easily get up to speeds beyond their abilities (and brakes) to cope with. Thing to remember for any Clwyds route is that at this time of year it can get pretty shitty in places but if you know where to go you can avoid the worst slogs.
There is still some fun to be had at Scousers, but most of the trails are now dead and burried. I found one worth riding from top to bottom, the rest would need a good old re-vamp, which is obviously not in anyone's interests, Don't want to wind up landowners.