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Meh....stacking lump is way overrated. I've honestly never stacked or sorted lump in my life and I have no problem keeping low temps or burying the needle on the high side.
Clean egg, no blocked holes, and WFO air flow are all you need. It will get there.
In this case I think the problem is the dude's choice in football teams. :P
Almost never. And if a few get blocked it would be partially and the other holes would offer plenty of flow anyway.
I have built 800 fires with lump consisting of not one piece larger than a golfball, most marble sized.