All my examples are showing group delay, below the resonant frequency, as negatively phased, whereas the group delay above resonant frequency is positively phased. That would explain some anomalies in the frequency response, above resonance.
Intensity has always been more negative than positive I believe.
But see, the group delay time scale needs to be shifted or compressed. I only have damping or resistance
to work with. with which to work. (GOD DAMN! What has gone wrong with my ability to Englishize?) So, in keeping with a desire towards more linear response, which would you try first? ... damping or resistance?
(This, last, could be a front-loaded question, which could apply to multiple topics.)