I agree with you about Nami provoking when she knows she can get away with it, but I find the lines of when she is just being herself and her acting with malice more blurred, she definitely uses her position to seduce Nika but she also is happy if he is happy. About Nami's metal stability, every one in SG has some trauma and I don't see a reason as why Nami would be different , her humour is come sort of defense mechanism and a away of express her felling in a safe manner. So while I agree that there is much to Nami than meets the eye, I don't think that there is much to build on their relationship, they already have a bond whether or not we are on her path I think it is more about the manage of it. A Race of Impossible Odds, her path starts as something doomed to go wrong, starts with Nami begging you to walk away, so I expect it to be about make this relationship that should not exist work.
I have talked about the jacuzzi scene and why I think it is important, as the scene in the morning after you sleept together. In short is not abou the scene in it self, is a rather small scene, but about the significance and that is another instance where Nami escalated the situation, to its extreme in the jacuzzi, and pulled back the moment Nika took action, the after where Nami is laid down on top of Nika and he teases her about who is control and he talks of what Nami's is afraid off, is what I missed most. That can't have the same impact now that their felling are in the open.