Many of us have been taught by oldtime,good cooks that the longer butts stay in the plateau,the better job of breaking down collagen and rendering fat.
You have one,or two bites to make an impression on your six judges.
You could get 180.0000 points,possible.
Some of us have won,or lost state championships by a ten thousandth of a point.
As far as fat up,or down,that is up to the particular cook and how their cooker cooks.
Some may keep the fat between the heat and the meat they intend to turn in to the judges.
Some cooks may cook 6 to 8 butts,eight to 10 lbs each.
They have very specific pieces/bites that they prefer to turn in to the judges.
Maybe a pound ,or two to make an attractive presentation.
They may trash the rest,sell-if they are vending.
They may donate to the fire,police,garbage collectors at the cookoff.
Many restaurants,that are considered good,render all the fat they can,and chop the whole shoulder to serve diners.
Most comp cooks,at home,cook an eight butt case,and don't trim at all.
Depends on what you are trying to accomplish,not what is "correct"