So I just bought a convection plate from horizon smokers for my Oklahoma Joe Longhorn. I was really looking forward to getting more even temps across the grill. I started cooking at about 3:00 this morning and was very excited to use this for the first time. My temps are running 30 degrees apart form one end to the other. I'm using two different digital thermometers. One is a maverick and the other is a I grill 2. Anybody have any suggestions on what could be causing this. I would only run about 15 degrees apart before I installed the plate.