While they sear on the first side, take a pinch (1/4 tsp) of the seasoning you made and sprinkle over the tops.
Allow these to grill with the lid OFF and wait for the juices to seep through to the other side.
Also check the sides, you'll notice they'll be "setup."
Then flip the burgers over - season this seared side with another pinch of seasoning and then cover with the lid for 2-3 minutes.
Then move the burgers to the cool side and repeat this process of searing and seasoning for the remainder of your patties.
If you like cheese, add the cheese now OR sear a 2nd time then add your cheese.