If that's the $400 stove you got a great deal! Did you paint it? Really looks nice.
The top of the stove will not give you an accurate reading, as there are air passages between the top of the stove and the top of the firebox. You can get a close reading from the side of the stove near the top. My pipe temperature usually runs from 150 to 300 degrees. If I leave the ash door vent open too far after reloading it can get up to 400, but that's overfiring the stove somewhat.
Have fun moving that piece of steel?
I've found that pea coal needs more air through the ash door draft vent to burn well, nut size I can run with less of an opening. I've found pea size seems to work best, though.
At some point you need to check the draft with a manometer, Harman says .06 to 1.0 " of WC, I run mine at .05.
If you don't have the blower that fits into the opening on the lower part of the back of the stove you should get one. The amount of heat produced is much higher with it. I can PM you with the info off the blower, you can get one from other distributors cheaper than from Harman.