What you are seeing for CPU speed is Intel's SpeedStep decreasing the internal multiplier from 9.5 to 6.0 during periods of light load. Assuming the rest of your settings are stable, under heavy load, your CPU speed will automatically increase to a little under 3.2 GHz. You will need better cooling (if you don't already have it) to go farther.
The basic idea is simple. You increase FSB, test for stability and temperature, increase voltages if necessary, repeat. The rest of it is a balancing act between core temps and voltage. Keep your core temperatures under 70 C. I use a program called CoreTemp to monitor temperatures. Do not exceed 1.5 volts on the CPU.