It is not a precise art Tracy.
Like u say close up in a decent lie, a flop works well.
If u are in 40-50 and have less than twenty yards, hit a full shot and add 8 - 10 yards of power. But expect a lot of roll.
Always move the dot right down to the bottom.
TBH I don't see 40-50% lies in bunkers too often.
For longer distances the punch works like on Kiawah #2, if u are in the front as u look, then u have about 40 yards to pin, a fifty punch there is perfect.
Here's an example on Oakmont back 9, ranked, champ greens and a 30-40 lie 53 yards from pin.
I hit a 68 punch full power.
No doubt someone will come along with better advice.