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I did some research on the use of a plumb to refresh my memory. A plumb is not used to level a flat surface, it is to show just what you have, to center something and make it perpendicular to a known flat and level surface. If you are using a level to check a wall stud you are actually checking to see how perpendicular the stud is to the level floor. You can layout the centers for studs on the top of the wall and transfer the centers to the bottom the of wall with a plumb bob, like yours. and mark the centers when the plumb bob stops swinging.
When comes to a pyramid you can find the exact center of the apex and use that as a center reference to keep the pyramid rising on center just as you have it, but not for keeping it level.