I have been using B&B or Cowboy branded lump in usually a mix of oak and hickory. That stuff burns at a very controllable rate for a good long time. I use is mostly in the BSK, but it even last a while when I use to get the offset going. I have never used any of the national branded lump stuff, but based on my experience with RO briquette in the past, I can see where you would say RO lump burns quick.
Willieboy - Big Steel Keg (coal burner) + Old Country Pecos (offset stick burner) - Tomball, TX