I've hand fed several tons of Alaska's subbitumionus C coal from Healy.
Add small amounts of coal to a hot fire, try to keep a flame though the added coal, this helps with the smoke and helps you recover the heat value in the gasses.
Check out the Usibelli coal data sheet: http://www.usibelli.com/Coal_data.php
Note the 29% water, I've added this coal to a warm fire and checked on it later and it was sweating and darn near putting the fire out.
Thank goodness it is low cost coal, I only used the larger size coal for hand fired, I'm not familliar with your stove.
I now have a underfeed stoker and I never see any smoke or strong smell.