The grate, Use the poker inside while you have a smaller fire going and scrape that middle area toward the front and down, I will every few days take the poker and do the "Ash ring" just to get any that didnt fall, then re shake it down. Clinkers can happen on long runs, but I dont bother to remove them anymore, some will get broken up and fall, others are just rocks now that retain heat and keep the coal all snuggly and warm. I have been running mine at around 270 at top side of stove lately. Running one at 600+ Can eventually warp the grate, BUT You may want to put a washer under the middle of the grate, and I would grind the edge of a new grate, put a small flat edge at an angle to help it form Not catching on the side. Also, If you do not have one, a Ash "Ring" is highly recommended. Clean out and load it full will keep stove able to run at slightly lower temps for a longer period of time with less chance of grate warp . Good luck!!