i don't wrap my brisket, aaron franklin has proven that it makes no difference
i went the entire smoke at 340. 10 lbs after trimming choice brisket @ 340 for ~5 hours, pulled from smoker at ~197 degrees then wrapped in saran wrap then foil for an hour
i do wrap the ribs b/c like i said, i like falling off the bone and the steaming in the foil helps. at 340, the back ribs which were really meaty, went 2, 1.5. in the foil i do parkay, tiger sauce, brown sugar, and apple juice (johnny trigg style)
one of the best briskets I've done. very tender, i was cutting 1/4 inch slices and it pulled apart exactly how KCBS wants it to. great bark. even the very first corner slice of the flat was moist and that piece has a tendency to dry out very easily.
of course at lot of the post smoke results begin with the quality of meat you're starting out with and Broadway Butcher doesn't mess around. his stuff is good, that's why i mentioned his source up above. the higher quality briskets churn out less burnt ends because the point is fattier than normal but I'd guess it made ~ 2 lbs of be's.