Interesting technique! :) This is what I say when people ask me what language I think in: it depends on where I am and what I'm doing,. I change between my three languages dozens, probably hundreds of times during the day, and they're pretty much at the same level of dominance.

The only exception is that I never think about politics in my first language, Finnish, because I read about politics in Spanish and English. Strangely, I have absolutely no Finnish vocabulary in what I do for a living.