why virtual waves help

I don't think the "small data set with no bias" vs "large data set with bias" is quite correct though. If it were 15 times more unique situations with some bias thrown in I would think you would be right, but these are all related to the unbiased situations, so we have more of a "data set with more details and bias" rather than just a larger data set. Of course, I do lose a significant amount on the TCRM by removing it.