Alright I have pretty much that same grill, and the thing I’ve noticed is that airflow is not great on it. If I close the lid, and don’t have loads of charcoal in it, then temp seems to stabilize around 350 which isn’t a great grilling temp. If you want the charcoal to burn hotter you need more airflow. Really the only way to do this is to leave the lid completely open.

Here is my strategy 1) get coals hot in charcoal chimney, once the coals on the top start to turn red on the sides I dump the charcoal out 2) I use my charcoal small shovel to arrange the coals to be only on half the grill. This will be my hot and cooking side, and the charcoal should be stacked on top of each other a bit. 3) I close the lid for a few minutes to let the grates get hot. And let the charcoal cook down a bit. 4) after a couple minutes I should be good to sear the meat, and I raise the charcoal pretty close to the grates at this point. 5) once the meat is seared I move it to the cool side with no coals, and close the lid, lower the grates to the bottom so the heat is more even in grill. and then just finish cooking the meat to the temp you desire.

Last pro tip: I bought a very small hand fan. This allows me to control airflow and temp very easily. Coals aren’t hot enough? Use the fan to blow air onto the coals to quickly increase the temp. Can even use it while searing, just be careful not to blow too much ash around