All of the above work for the reasons stated!
If steep stepy tech is your thing then hike a bike up from Haweswater to the top turn round and go back down – repeat until you clear it all without dabbing…
More normal people may prefer Going Kentmere, Sadgill, Gatesgarth and across to Nan Bield with out going down,,, and then into Kentmere valley down the south side. If you are starting at Staveley I’d go up Green Quarter and down HP Plantation and not three rivers.
Alternatively start in Kentmere (but you will need to park very early to park on a Bank Holiday weekend with nice weather) and do Nan Bield as above but when you get back to Kentmere head up towards three rivers but go round to High Borans, Dubbs and over Garburn for extra downhill action.