"Tanners tips" says that a thumbs up in deep cuts should count as a thumbs up in the main station, and also tell your main station you like deeper cuts in general. My experience is that if I thumbs up a track in deep cuts it remains less likely than other cuts to show up in the main feed. I would expect that regardless of which mode I was in when I thumbed up a track it would be in equal rotation in the main station. My experience is that the same old tracks mostly show up in the main station, and to hear the tracks I thumbed up in Deep Cuts I generally need to be in Deep Cuts. The variety I experience in my main station isn't growing as I'd expect.