Flashing the BIOS can be risky. Also many OEMs have custom BIOS available only through them. BIOS updates are designed to address known problems. Inability to OC is not considered a problem.
Besides, a .2 increase will do nothing for you in noticeable performance. And could potentially decrease the life of you hardware.
You may want to monitor temps with what you have done. Air cooling is capable of doing the job, but, there are other factors to figure in. Case design\size, internal airflow = cables, wires obstructing the flow. Other heat producing hardware = hard drive(s), memory, CD\DVD drive if used regularly, CFM rating of the installed fans. Room temperature can have an effect as well.
Edited by ThunderZ, 13 January 2010 - 01:10 PM.