Thanks so much for the replies, they're very helpful. I wanted very much to try with a smaller quantity of charcoal because I felt we were probably dealing with some partially unlit lump (my KK's joint custodian wasn't so interested in my theory... well, well, well.) The charcoal we used this time (from Whole Foods) seems to be a lot better (or at least a lot more forgiving), so I think part of it is the mesquite thing, and part of it is just Lazarri. Some of the "lumps" that come in the 40 lbs Lazarri bags are small tree trunks, they probably just take a long time to get completely lit.
I'm not sure we're giving away the mesquite just yet, but I can say the difference in smell during the cook is huge. Our KK is 100' from the door to our house and we always had to make sure it was closed during a cook because otherwise, the house smelled pretty strongly of smoke. The new charcoal was fine with the door left open for the husband's pulled pork burn last night/this morning.
Maybe I will try the mesquite once more on a pizza night, and use somewhat uniform sized pieces, leaving them even longer than usual before raking the coals. Maybe I'll convince the husband to try this approach with one of his meat creations... (yeah right)
Thanks again for all the help!
Kerry