toedder: there are various MET (Match Equity Tables). gnubg--and any other capable playing software--should let you specify which MET you want to use for cube decisions. The MET are tables showing the theoretically expected match winning percentages from various match scores...assuming equal-strength opponents.
The MET are less important at scores such as your 17 away / 16 away. But I'm currently trying to memorize those values out to about 7 away / 7 away for real-life tournament play.
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