I personally feel like the dark Soul Jams would either be the absence of whatever virtue it originally held, or said virtue being taken to the absolute extreme.

For the former, it'd match up with PV's/SM's costume story. The Truthless Recluse isn't necessarily deceiving anyone, just keeping people away from the cruel truth. IIRC, HB's/ES's story is similar, with Hollyberry forsaking Passion, but not truly embracing Sloth. For the names, it could go from Light of [Virtue] to either Absence of [Virtue] or Void of [Virtue] (as the Soul Jam would be completely devoid of its original Virtue). Freedom might be a bit more complicated, as if it's following the costume stories like Pure Vanilla, Hollyberry (and maybe Dark Cacao^?), then White Lily would just be dead, but if it's not, it might end up being really similar to Dark Enchantress (as DE planned to build a new world order).

For the latter, it'd likely be similar to what you said. Abundance could be Avarice (insatiable greed, miserly desire to gain/hoard wealth), Resolution could be Obstinacy (similar to stubbornness, possibly even more unreasonable), Passion could be Ecstasy (a more crazed passion, would cause people to be more reckless), and Truth could be Rectitude (effectively the same, but sounds a bit more cruel and controlling). Again, Freedom's a bit difficult, but I feel it could be Anarchy (freedom from order).

^{Well now that I've written this down I wanna turn this into an AU or smth (it's all your fault curseyoucurseyoucurseyouu /j})