Ring
What you have put out sounds like a very advanced method of what I have described. Just done it on a set of 500 blades by weighing tip and root weights while repainting blades. Blades went on D model 5 runs to track blades up to 135 kts straight and level. At no point did we need to balance the blades as The Chadwick was going round in circles. So we must be doing something right.
Had the same result with loads of blades.
Agree with OEM's and blade overhaul shops. Have discovered so called master blades weigh differing amounts