OK, I get it more about the sizing issue (you're the expert).
I like the new one (#5) the most so far - looks great. I looked at your profile and also loved the one you did for "run of the Class" with a squarer visual element. Our Cooperative Research Centres are about delivering research to society to improve the economy, the environment and society. It's probably asking too much of a logo, but something that conveys that we are the guys delivering outcomes in a number of areas would be cool.
We do it by bringing together Universities, research agencies and companies to get outcomes. So the "Collaboration" theme is about getting them to work together as best they can (they come from very different cultures).
I do like the brightness and excitement more than the classy/B&W of #2, so prefer you pursued that angle than use more time on the #2-like ones.
Again, really appreciate the time and talent.