sgb's suggestions all seem pretty reasonable, and in most cases, obvious.
As for the rebellion changes, δ:
I'm not sure that tiredness should affect the stat at all; if it does, it should actually lower it once the girl gets tired enough.
If/when the matron mechanic is changed, I'm assuming this computation will have to be tweaked as well.
Should multiple guarding gangs' effect add up?
I'd increase the effect of PCLove in decreasing the stat; there should be a way for a high-spirit girl to be amenable, and I think love is a good way to do that.
Should there be a scaling factor for the PCFear/PCHate calculation? You can have two relatively low values for each, but that won't matter if they're different enough.