yup, increase the feed rate. The amount of fire you illustrated is just a little more than what is burned while the stove is at idle and NOT heating your house. At full burn you should have only about 1" of ash at the end of the burn plates and about 3-4" of hot coals.
Here is the manual :
http://www.keystoker.com/manuals/2012/Koker-Thermostat.pdf
