Below is your IB Response superimposed over your ported response. They were superimposed so that the 85db and 95db lines were matched as that is the calibration point of each as you mention above.
You'll notice here that they are within 2db or so at 10hz. Remember, we are looking at 10hz because that is the frequency in consideration to test the hypothesis that around tune, ported produces more TR. Mk's IB ported setup is tuned to 7hz.
However, when MK took readings with the VibSensor, he took the reading for his sealed IB running 10db hot. When he did the ported reading with VS, he ran flat.
In the below graph, I increased the IB by 10db to compensate for running his IB hot.
As you can see, MK was running 8db hot (once you calibrate the two responses) when comparing FRs. Yet the Vibsensor shows drastic
differences in the TR at 10hz...18db difference!
More evidence that TR can be increased without an associated increase in SPL, and that around port tune, ported subs produce more TR as compared to sealed.