Maybe if other teams spend less time on the Blues is because that's the CD the most difficult part right? Isn't that the part where we're supposed to be able to tell the best from the rest?
I´m not making the connection you seem to be making. All teams must skate the pattern and the partial step in the blues section so we can judge them all on those elements within this rhythm. The steps must be skated in the other rhythm. That leaves lift and twizzles and I will go out on a limb here and guess that it's maybe less taxing physically to perform these elements in the slower rhythm then it would be in the faster rhythm (less energy exerted so legs are fresher).
But really I just would like to see an equal distribution between the rhythms, I just prefer the balance. When a majority of the time is spent on one rhythm it just gives the impression the other rhythm was tacked on to fulfill the requirements.