absolutely great post.
However, there is one thing i want to add, and you should do a section on this.
I know you said it is always necessary to stay right behind your bunker, and to play it tight. This is true about %85-95 percent of the time. However, if you are playing a field layout with lets say a large carwash or some other bulky bunker in the center blocking a lot of lanes, if you line yourself up right, you can use that. Not for an extended period of time, but for example you could probably get away with staying there a few seconds off break.
The other situation is, on most fields there are sweetspots out in the open. They are usually hard to find, so walk the field before you play a game. However, there are usually spots on the field which you can stand out in the open in for a small-medium amount of time safely. Im talking about spots in which you only have to worry about 1-3 bunkers.
for example. If there is a sweetspot near back right you could stand out in the open and have one of the lane blocking bunkers preventing you from being shot from snake, if you are far enough away from the tape you will most likely not get shot from there, and at your angle perhaps a few standup cans cancel each other out. If you only have 3 bunkers to worry about and you know for certain that someone is not in that bunker, you only have 2 to worry about. You can put those people in their bunkers, allowing temmates to pinch them, and/or you to move up.
Remember, you gun is your best defence, period. Standing out in the open and putting people in their bunkers is better than standing behind a bunker with no gun.