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The long burn may have been due to the Lumberjack... they use the outer layer of wood and bark and this may have prolonged the burn. Pitboss flavor pellets are a blend 60/40 oak or alder with the flavoring wood. The hickory is all hickory from my research because hickory is fairly plentiful and cheap...
how about reducing the air intake to the smoking tube to help it burn longer? reduce oxygen to the burning embers which in turn will help reduce smoke density and extend burn time. at least that's my theory.
I reduced the air intake to my 12" smoker tube to half what i would normally have open, and got close to 11 hours of thin blue smoke. That's with 224g of dust. Wide open air intake would get me 7 hours. This thread has been very helpful in tweaking my setup.