Well lump burns hotter than briquette right and doesn't last as long.
Correct, as far as I can tell.
For what it's worth, I use a single layer of RO briquettes (after placing my smoke wood) on the grate, and then I fill the 18" smoker with heaping pile of lump. The single layer of briquettes acts as a barrier to keep small lump pieces from falling through the grate. I then ignite a small load of used coals for the 18" smoker's fire starter.
With this setup, I can get 8 to 10 hours of steady heat, although due to the nature of lump, I have to refuel if I want to expand smoke times. I have never tried lump in the 14" WSM due to the many unusual sizes and shapes which would leave large air gaps in such a small ring.
Weber coals, in spite of their price, may be a viable alternative to lump if it burns as long as forum members says it does, and it also has the added benefit of a nicer burn-off smell - which could add to the meat's flavor like lump does.
I like blue bag Kingsford, but I can't stand the burn-off smell if it gets in my food. I tried smoking a pork loin last week with Kingsford, minion method, and even after nearly an hour of waiting, blue burn-off smoke was still present. Pressed for time, I put the meat on, and the acrid smell transferred to finished product.
I still have much to learn though considering how blue bag Kingsford is the coal of choice around here.