How can you tell if you need to add more lump, I iave had egg burning bout 13 hrs. Chasing temp all night bout 230ish grid 225-250 dome. Vents open alot more than normal for that temp. I now have fan running into bottom vent temp rose back to 220 grid, but will not hold. Current 2258 dome and 210 grid with vents set to what snould be about 400* in summer. going to try wiggleing the vent holes.