You might want to pick up an infrared thermometer to check various spots in your grill for hot spots. I picked up one on sale at Amazon.
amazon.com/KIZEN-Infrared-Thermometer-Gun-Humans/dp/B07VSHR9M6?ref_=ast_sto_dp
Just make sure you aim it a the matte black parts of the grill, not reflective surfaces as you will get incorrect temperature readings.
I have an Ironwood grill and found that my temps are fairly consistent across the grill. I chose that grill partly due to the dual discharge slots at the back of the grill rather than a single smokestack. That should help with temperature uniformity. I believe the Timberline has similar slots.