AmazingRibs loves 203F as a rule for a packer ...
I don't dispute it as a great temp for a whole packer, because the point really need to get all the way up there or there's too much fat between teh fiber bundles ...
But my flat is always a little bit dry if I let it go up there with the point ...
That's why I usually enjoy the point the 1st night (or morning, depending) - fresh - and use the flat for leftovers (which I can address with fats upon refrying or BBQ sauce or cheese etc) ...
I think the flat is really delicious when it's cook is arrest a little below 200F and it's allowed to tenderize over a nice slow, gradual rest ...
Saves 30-45 mins of cooking time, too - which is nice on a brisket IMO ...