Interesting look at the charterers, I do think each has a different issue to deal with or overcome.
I think Jasnah's problem is that she is paranoid. The have been allusions to this; how she puts her back to the wall, spying on her own family and so on.
For Eshonai/Venli I think it is a inferiority complex of some sort. They think the other sister is doing more for her people.
Ash's issues may be as simple as guilt. To both Taln and the people she betrayed.