I don't recommend The Dosadi Experiment as a good example of rationality; I explicitly de-recommend it.

The Vor Game, aside from being delightful, can be seen as a wonderful lesson in how setting priorities can be helpful, but it's not about rationality, it's about personal manipulation. One character groks another's motivational structure and creates a situation that will make her "fall off the horse", so to speak.

Vorkosigan works primarily through charisma and sub-conscious analysis. He's not a rationalist in any particular sense.