Remember to not exceed 1.3652V.
That is true... if you raise your voltages too much, you can drive down your processor's life.
When overclocking, you'll often hit a point of diminishing returns. For example, you may reach a point where you'd need an additional 0.1V+ just to get the CPU stable at a speed 100mhz faster. 100mhz isn't worth all that extra voltage which will decrease the lifespan of your CPU.
Your CPU is cool right now... overclock it until you reach your desired speed (it should be easy)