Galaxy Flyer,
.. which is why you see Mutt and me regularly revisiting Vmcg considerations in this forum for the benefit of the newer folk coming along.
Concur with your observations...
For civil certification, Vmcg is a "line in the sand" issue rather than just another tactical calculation to be done as in your operation ... your observation about lightweight departures in strong crosswinds is our particular concern .. quite common in the airline short distance positioning game.
As a sideline observation, the variation itself varies with Type but 0.5kt/kt for twins increasing to something in excess of 1kt/kt for four motored beasties is reasonably typical ..
Numerous old threads have things to say on the topic ..