Yep.. mine wobbles in the direction of motion... not an issue : )
Hi Rob, welcome to to ECF, and the Darwinians. Mine has always had a little wobble, within the direction that it swings, but it has never been a problem. I have had mine a little over a month. Be sure to explore the differing heat ranges. Since Darwin can control everything so well, there is no need for low-resistance atty/cartos, they will limit the range of what Darwin can do. 2.5 or 3 ohm ones will also use less power, and make the battery last longer.
Be sure to get some low-nic juice, so you don't OD...