I doubt what you say very much. I speak from experience from the last 16+ years of being in that exact position to see how it works first hand.
....but you quit....and it wasn't yesterday so don't act like it is.
In your
last 16+ years 
, you may not have been exposed to the inner workings of a Union shop....
...unless of course you were in the office as a PM, super, estimator, or clerk.
Were you any of those?
Foreman, AGF, GF...any of those?
Been privy to the bid package?
What were the numbers quoted in it to the client?
Are you a union member?
Is your company signatory?
How are those questions relevant ?
I can assure you, the percentages I have posted are dead nuts on and relevant....
A foreman's rate is $55 and change plus bennies, a Super/PM commands $71 plus bennies.
You tell me....what does a foreman make /hour...a PM/Super?
In spite of what you think you know....you don't know squat about me.