Jim, that should be a sweet descent. I climbed up from the second Crabtree lake last summer, but got way too high way too soon. I had to descend and traverse quite a ways before I could get over the Discovery Pinnacle.
If you head straight downslope toward the middle of the upper Crabtree lake, I see the topography steepens in the lower area. If you just trend more westward (to the right as you descend) if the terrain gets too steep, you will find the bench just west of and above your lake. From there it is easy to get down.
Click on the picture of the lake (above) for a full-size view, and you can see the easier slope and the bench.
