Last night I really had my 550 cranked. Started with a cold stove about 3pm and had a good bed of coals by 6. After adding a good number of splits the magnets on the top center inside both read 800 degrees. Using my IR the glass read 600 degrees and it was too hot to get a reading on the coals with the door open. How high have all of the other 550 owners burn their stove SAFELY? I have also insulated both sides of the stove between the fireplace walls with fiberglass . Any thoughts about this? Insert keeps the upstairs about 72 degrees.