Techy, there's often a big difference in advertised spec and actual as purchased and measured spec... Although I suspect the arrows you listed are spot on...

I see ACCs as the best of both worlds, excellent spec tolerance of aluminum and carbon durability (up to a point).

My groups shrunk considerably simply going from GT5575s to 3/49 ACCs. I won't worry about spine degradation until my groups start to open up again...