I have a old country pecos and having trouble controlling the temps in my pit ? I can get it set around 225 and walk away for 30 min and it will be 325 to 350 so bump the intake very little check in 30 min and it is 175 the stack is wide open any help would be appreciated . I am also using a maverick temp gage Sealed cook chamber with RTV and fire box with stove rope. I have also raised the fire grate 3 1/2 to 4 inches. Here is picks of the mods I have done. All help will be appreciated.