With Round Robin, when a pool fails for 5 minutes it will move to the next pool and mine on it until it fails and then moves to the next. If your primary pool is a good one and never fails then it will never move to another pool.
What behavior are you seeing?
What behavior are you expecting that your not seeing?
I was trying to maximize the amount of shares I got, that's why I was thinking round robin would share time for both pools so I wouldn't miss out on either with my hashing speed. I'll just have to finish one and stick with the other. Both seem good except one was bitminter and if its donations don't get in the way it would be nice with more mining power out of my shares in it.
Balance and load balance are probably more along the lines of what your thinking.
Maybe the new quota's would help? Don't know much about what quota's are yet myself.