Be careful with the elevator throws. Because it is a plank, it will not need much elevator throw to make it jump. That is, once it is moving. I would think that 10 degrees up and down would be plenty.
I'm still having trouble hand launching the Plank 101 in calm air. As in, it can't be done. I just dives straight down.
I've seen other Planks suffer the same problem. Because of this, for the first test glide, I'd suggest a low force bungee launch.
Launching in good ridge lift with some up trim is no problem.