For a "newbie," Lannoos, you nailed it.
For Colorado Rick, listen to what Lannoos said. You had the vents open way too wide for too long. As was noted, you can't bring the temps down easily on these grills, so ease up slowly. But, you seem to cope with all this well enough to turn out some decent ribs. Hot & fast works as well as low & slow on many cuts of meat.
Second, where are the pictures, man??? You know the Forum "rules." We want to see the grill and your cooks.
Lastly, WELCOME to the obsession!