"New" Warm Morning 500
JS: Above is a link to a thread I found to help me with my WM.. I also posted on it a good bit and got lots of help. My WM was totally out of control and my strong drafting chimney was the cause. Page 6 shows some pics of a home built rosemont I did that dialed it in and got the burn times to where they are today.. still not what I want and yes probably because of air leaks that I have and can not really fix unless i tear it apart.
My chimney was running 1.5 up to 2 even and now with the rosemont, MPD and Baro I am getting .03-.05. If you did this you might get super long burn times.
How many pounds of coal are you able to add to fill it up and what type of coal are you using, lump, pea, nut, stove etc. Also it may be that the Alaska sub bit is just not comparable in burn time expectations as other bit coal.. that I can not test.
Best of luck