A plan doesn't have to be exact to be followed lmao. HE follows the best course of action that is available to him, which is tagging along with a group of people who seek a cure/control. I think he probably understands that a cure may not be possible at all. (I think we will never get rid of the tadpoles in the game, they will stay with us forever)
It is also obvious that he wants to be free, so that's a plan. Also what I meant by "damn the consequences" is that Astarion will never get into insane fights that will result in him being disadvantaged. Wanton murder may fly in the wilderness but it won't fly in Baldur's Gate.
Also when talking about his master those are the two options that he has. It IS concrete, because both options result in his freedom. It's only a question of whether he wants to become a true vampire.
Interrupting sex of two dangerous creatures looks pretty stupid, deadly and crazy. Looks like a crazy fight, haha. Killing Kaga is also a crazy thing to do. At least, if you do it from the very beginning and in front of everyone. I'm sorry, love him so much, but I don't see what you see. Just because I always think about how profitable it is for me to do it. And he thinks about pleasure and freedom, not risks of losing something. Even if it was his life. He was ready to sell his soul to devil in a moment of panic, think about it.