Just started a 3-2-1 rib smoke on my new GMG Daniel Boone grill. I'm trying to get my grill to 225. I set the grill temp. to 265, but my Maverick temp probe (stuck through a potato) is reading 190. I tested the Maverick probe in boiling water and it was within 1 degree. Should I trust the Maverick and just keep raising the grill temperature until I get 225 on the Maverick ? Any ideas on why the GMG would be that far off ?