Made my second attempt at smoking on my new KK last night - the 1st was baby backs at 225 for 4 hours that went well once I got the charcoal lit, which convinced me to get a weed burner and a canister of mapp gas. This round, I used a combination of kk extruded coconut and cowboy lump with some hickory chunks. I used the weed burner and thought I had the extruded stuff started well; the lump was going good, so I put grids, diffuser, and drip pan in. After a half hour or so. The temp was up to 180 in the dome, so I put the butt on the upper grill and closed down the chimney so that it was about a half turn open and the damper down to about a quarter inch open.
I checked before I went to bed and the temp seemed rock solid at 200.
Got up this morning and cheeked the kk. The temp was at 500 and butt was burnt black.
So, where did I go wrong? My suspicion is that the coconut charcoal wasn't burning as well as I thought and the temp shot up when it finally caught good, but since I have little experience with it, that's just a guess. Any thoughts?
As an aside, I've placed the heat diffuser on the lowest grid both times I cooked. Is that the right place for it, or is it ok to just put the diffuser on the fuel basket handles?
Thanks in advance to any responses !