I started with KBB on my WSM and had fine results but couldn't get much past 250. Since switching to various brands of lump, I can run much hotter as needed. Haven't had much problems with swinging temps with it and the minimal ash is great. Usually after loading a full bag and doing a "longer" smoke, I still have some left over. I sometimes use KBB in a pinch or if I'm too lazy to drive the extra 5 miles for lump.
WSM 22 ~ WSM 18 ~ Maverick ET-732 ~ Flaming Fast Thermapen ~ Weber SS Performer ~ Weber 22 OTS ~ Weber 22 OTS ~ Weber 22 OTPlus ~ Weber 22 OTS ~ Weber Q300
When all else fails just ask yourself, WWGALD???