Unfortunately your wood is not dry and that is contributing to poor burn times and is why you may need to keep the bimetal thermostat higher than you'd like. Your stove needs more air to burn off all that moisture. I started C/S/Sing wood in Nov of 2012, so not quite a year old, but I get no sizzling and I can put my thermostat on 1.5 dots and it'll go all day with the blower on low as well. Next year will be better as you get dryer wood.