No, 'swimming the high currents' means leaving one's home planet's gravity well. A human would say 'walking the high road', I believe.

[Well, a human wizard. S'reee has never asked what non-wizards say.]

I haven't taken any extradimensional excursions. My Art keeps me closer to home.

[And yet, she says it as if that was an option, like a spaceship pilot explaining they take in-system jobs rather than between-system.]