For the past couple days, I've been doing ascent and decent practice on a doubled rope. One thing I noticed is that just letting the Blakes's hitch unload makes for a kind of stop and go descent. So I tried descending using a Dulfersitz to generate the majority of friction, with the Blake's generating the balance, and acting as the backup. It seemed to allow for a very nice smooth descent, and takes all of 5 seconds or so to implement. Is this unheard of?