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The CoRoT field LRa02 has been observed with the Berlin Exoplanet SearchTelescope II (BEST II) during the southern summer 2007/2008. A first analysisof stellar variability led to the publication of 345 newly discovered variablestars. Now, a deeper analysis of this data set was used to optimize thevariability search procedure. Several methods and parameters have been testedin order to improve the selection process compared to the widely used J indexfor variability ranking. This paper describes an empirical approach to treatsystematic trends in photometric data based upon the analysis of variancestatistics that can significantly decrease the rate of false detections.  Finally, the process of reanalysis and method improvement has virtuallydoubled the number of variable stars compared to the first analysis by Kabathet al. A supplementary catalog of 272 previously unknown periodic variablesplus 52 stars with suspected variability is presented. Improved ephemerides aregiven for 19 known variables in the field. In addition, the BEST II results arecompared with CoRoT data and its automatic variability classification.

Improved Variable Star Search in Large Photometric Data Sets -- New Variables in CoRoT Field LRa02 Detected by BEST II