Try using Trace Analyser:

ftp://oracle-ftp.oracle.com/apps/pat...MANCE/TRCA.zip
Trace Analyzer compared to TKPROF
Recent Releases of TKPROF provide a limited list of WAIT EVENTs per SQL Statement. Prior Releases did not provide any. The Trace Analyzer provides a detailed list of WAIT EVENTs per SQL Statement for any Release of RDBMS higher than 8.1.6.
. . .or make sure you have the v.latest tkprof.