>

So then, what is the point where the transition from the unloaded small signal model gets swapped for the power/large signal one? Specifics, and some numeric analysis would be quite useful if you can.

What does the transition from small to large signal look like and how is it best described? some detail please. The load is always in parallel with the plate resistance. At what power point does the load start changing the response?

This point is valid for an ideal inductance. the self resonance puts limits on deliverable impedance. it is not omega*L but is it going to be enough to consider it as that?