The drills were giving me fits, but for some reason, playing the song flows much easier. I might have worked on that song in a similar fashion many many many years ago on my first pass at mandolin. It seems a wee bit familiar, but I am not sure. At any rate, I am enjoying it. I have only hit it a couple times for 15 or 20 minutes. Once I get it ingrained I think it will sound really neat.
Unfortunately on the double ups, I am not real efficient as I am still lifting the pick a bit. When I go real slow and focus I can keep the pick going straight up through the strings (which is kind of the point).