my first couple cooks were a little wonky getting used to my g2 chub but after figuring it out, it seems to cook better and better each time.
are you talking about guru temp probe clip? I usually just creatively drape it over a rack near the middle. if Im doing big cuts, Ill stick a skewer in and clip the probe to the skewer.
dont be afraid to rotate the ribs. I actually put the racks in backwards and at 2-3 hours flip it around like they should be. minimizes and front-back differences