Corrections: A couple of things, I'm learning. There is no "A", therefore there are only 4 scales (rates). B (base), C, D, E.
Also, I hear that BWG is NOT in the "adjusted" group. So, we can remove that one from the list, I do believe.
Lastly, cost of living weighs less heavily on the equation of pay rates (GPD), than competitive hourly rates. It is said to be a factor, but not one easily or undeniably verified. Also, the exact source of competitive hourly seems to be vague and we are not sure of the exact criteria used, or not used. We know the firm used, but we don't know the data. General average, Driver average, or what? Still, regardless of method/source, it seems clear to me, there are serious flaws.
Just sharing the most accurate info available. Hope it helps...
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