I don't see how coinchoose can change it to 60% because one person creates a topic on worldcoinforum about it claiming to speak on behalf of everyone.
At the very least make a forum poll and see the results from the community. Undoubtedly the amount received is less than 100% but I would place it in the 80-90% range.
I agree it seems a little quick to just make the change. When we calculated the 60%, it was multiple miners and pool operators that had agreed on the number. Again, this was in the very low difficulty days, and im pretty sure that number has changed to 90% since then. Running more tests to confirm, will take a couple days.