I just got an Oklahoma Joe's Highland smoker. I've had good luck so far, but experiencing big temperature differences from side to side, like many others. I've added the baffle +45 degree bend that directs the heat down, and am going to make a convection plate like the one at BBQSmokerMods.
I've seen a lot of threads on folks using the convection plates, but no specifics on what people have done to get even temperature distribution. So what diameter holes, number of holes, and spacing of rows has given folks the most consistent temperature across your Highland smoker?