I'm assuming this is one of the larger climbs/vertical displacements that Percy has managed in a single sol. This old crater rim is definitely the steepest terrain the rover has tackled, which might limit the rover's progress on driving days, but I wonder if the all bedrock we've encountered along the way is enticing the scientists enough to take it slower.
It was, the climb on 1274 currently holds second place on the leader board, the highest elevation climb in a single drive is currently 26.4 meters (sol 1268), but that was over a marginally longer traverse, so probably a very similar average angle. I agree that the team have appeared to pause the drives whenever they spot an enticing target of opportunity :)
Pity we don't get frequent and detailed mission updates (Like we get on MSL). The PDS mission manager reports are amazing, but they are only made public at least 6 months after the 'event'