New Splash logs a bust?

[TheatreTech]

If you've yet to hear, Splash Mountain has new logs with an additional row in the back that is big enough for two smaller people. Making each log able to hold up to 7 people.

Last week they were filling the logs. (All seven people when possible.)
But today, I went on the single rider line and noticed that the CM loading people wasn't putting anyone in the back seat. At first I was a little pissed because there was a decent wait for the the Single Rider line and there were plenty of people waiting to fill the seats. After about 5 minutes I realized that there had not been one peron in any of the back seats since I had started waiting.

Finally, I was called to be seated and I asked the CM why they weren't seating people in the back. She said that the boats were back-heavy and sometimes wouldn't make the turns; and they broke down several times last week because of this.