I like Gisburn, but it’s definitely contoury. What about Lee Quarry or Stainburn? Both more “sessiony” but good fun. Or you could probably get to Llandegla in less than a couple of hours, that seems to be pretty highly rated.
Not a huge fan of Dalby myself, it’s one to smash round as quickly as possible rather than to play on the descents, put it that way.
You could also hit Grizedale in around 2 hours I reckon, which I wouldn’t recommend for just the trailcentre, but mix it up with some of the natural descents in the area too and you’re onto a winner.