your on the right track i'de say. Except that w/ each cut there finished at different internal temperatures, i've found they become tender most generally between about 185-195, but sometimes not till 210's! I use to try to rest for like 2 hours but i've found results to be the same after an hour and sometimes in a rush I just hack into it after 30 minutes. Im always trying to figure these things out and one thing i've never read, that i've noticed is that after the 170's range (internal) they begin to look dry and look like they've had enough, but if you hang in there, all at once they'll come back to life and start looking moist again, I'm totally guessing and have no idea but I began thinking that was those fibers inside finally breaking down and releasing moisture somehow. I do know that somehow the moisture you get at the end result (the juicy moist, tender we all hope for) is somehow inside the meat, not really much to do w/ fat or anything. I cant back any of this up, sorry lol. But just a few things i've noticed.
You do cook till tender correct,and not a temperature in paticular? If it makes you feel better sometimes the briskits i've cooked have never really hit that room temp butter stage when you poke em'. I found that out the hard way, (although I dont have this problem often at all). The only thing I watch as far as that goes is that if its past 190 (internal) and it appears "juicy/moist" (but NOT tender) by looking I stick w/ it and let it cook, but lets say im checking every half hour for tender and so the next trip down I see its 194 (internal) and appears to be drying out BUT still NOT tender like room temp butter, im personally going to yank it off and only rest it like 30 minutes completely uncovered. (so it cooks as little as possible from the carry-over heat).
Im no pro at all but ussually they turn out plenty good enough to eat. Generally what will happen is they will hit that tender mark SOMETIME?.?... i've only had a few strange stubborn ones.
When you get that tenderness feel down, then you can pull it off just before what you think is tender as so the carry over can finish it just like you stated, I try to do this often but it can be a tough call for me at least. Then again its close enough for me, you wont hurt it any,
.
* oh ya and they often shake around like jello when there good and done, lol. hope that helps a bit.