Confusion!?

2312 - http://support.microsoft.com/kb/2801413

Use when running SQL Server 2014 with database compatibility level 110, which is the compatibility level for SQL Server 2012. Trace flag 2312 forces the query optimizer to use version 120 (the SQL Server 2014 version) of the cardinality estimator when creating the query plan.

9481 - http://msdn.microsoft.com/en-us/library/dn600374%28v=sql.120%29.aspx

Once your workload is running with the new cardinality estimator (database compatibility level 120), and a specific query has regressed, you can run the query with trace flag 9481 to use version 70 (the SQL Server 2012 version) of the cardinality estimator.

Since you don't have the option for trace flag 9481, then changing the compatibility level to 110 is the right answer.