1. What hiroshimascarp linked to has "box plus/minus," which is an estimate per 100 possessions. The page does not have +/- while each player was on the court.
2. What I said about Butler was my opinion, not a prediction.
3. All CAA teams use StatBroadcast during games, which is my favorite statistics format. If you change the URL to a number you make up, you can find statistics from many teams and sports going back years. It includes +/-.
http://stats.statbroadcast.com/broadcast/?id=367236 is for yesterday's game. Williams was +1, and Butler was -9, so the difference of 10 was half of what you guessed. It has a season tab, and here is the season +/- for your players who played yesterday:
Juric: +55
Wynter: +53
Martin: +48
Washington: +37
Butler: +33
Williams: +23
Bell: +17
Oden: -9
Brown: -16
It adds up to +231. You've outscored opponents by 52, so that's +260. Okros, House, Terrence Butler, Wang, and Atsuren combined for +29. The efficiency statistic is very different from +/-. Among those nine players, Juric leads in +/-, and Oden is second-to-last. In efficiency, Oden has 82, and Juric has 42. Oden has played 6 more minutes, so the difference in playing time can't affect efficiency much.
Your schedule has the statistics links for every remaining game.
http://stats.statbroadcast.com/statmonitr/?id=367240 is for your game before the CAA Tournament. If you bookmark that, after the game it will have your season +/- for everybody who plays. I want to thank you for bringing it up because I hadn't realized that it has season +/-. StatBroadcast is my favorite form of live statistics for any pro or college game. You can export statistics to a PDF during or after the game. When Hofstra plays a nonconference away game, before the game I care about the quality of the opponent, the availability to watch, and if the school uses StatBroadcast or an inferior type of statistics such as Siderarm Stats. All CAA teams use StatBroadcast for all sports.