One of the better dynos in Yosemite lies off the beaten path down past Camp 4, in the Crystals. A thin, delicate face leads you to a huge dyno. The beta that worked for me was to dyno while using my right hand to keep pulling down even as I was flying through the air.
To get there: hike the Camp 4 campground trail past the campground and after about five minutes, the boulder will be just off the trail on your left. If you've reached the moat, you've gone too far.