Yeah, Chris is right about almost everything.........ramp the bugger up & power thru to the big finish.........
Only thing i don't get about what he said is this:
"I'm eating a 9 pound butt in under 7 hours......"
Only takes me 30~35 minutes to eat a 9#'er.....once it's finished, that's only about 4.5#
oH, AND ABOUT THIS:
"P.S. What'll happen if I cook too long, even at too low a temp?'
How I 1st did low & slow was putting something on, having too many beers (in the olden days, 23 years sober the day after the big convention) or being too tired & FALLING ASLEEP.....next morning or sometime in the middle of the night, wake up, rush out, still sputtering & completely rendered & tenderized.....I have a very good record of doing this & having it not go to completely dried out....maybe 6~8 times in say, 38 years......