The OC result is good but the temp is not so good, although not yet bad, actually I can live with that 74'C on Prime95.
But, you have also the correct idea about trying to get further cooler if you can.
The usual stuffs to be checked if you have temperature issues:
What is your room temp? How is the air flow in your PC case? Did you mount the cooler (incl. thermal paste) correctly? All fans are running correctly (inlc. blowing direction)? How about the dust?