Disclaimer: I've not done this (and assuming you're playing NCAA 14). However, there could be an issue with 11 teams. There have been plenty of posts discussing how C-USA's schedule is messed up when it is a 13-team conference, which I think is odd because the MAC was a 13-team conference in the 2013 season. I would tend to stay with an even number of teams in a conference unless someone has done this and can confirm there is no issue.