So, I've also been going into CSE and starting the match by saying to the team, "Can we all agree that popping a cube early is a BAD thing?" It always seems to get a chorus of YESes, and there's a lot more coordination lately in CSE in general lately. Haven't been seeing the Kang explode nearly so much.
You've been luckier than me then. I've tried CSE over a dozen times in the last couple weeks and failed every single one. I explain in chat every time that popping a cube too soon will not be good, but there's always that one jerk that either doesn't listen or pulls the whole "I'll play how I want" routine.
I have noticed that ISE is much better, though. Most of the time I'm in PUGs that finish with at least 5 minutes left on the timer.