Each chip is different so there is technically no "best setting" that would fit all 3770K's. My advise would be to follow this guide to get your best possible overclock. 4.5GHz sounds like the best you can get with your cooler. Mostly only the turbo voltage offset needs to be increased in tandem with the multiplier until you get a stable clock. You don't have to tweak many other settings.
Cheers.
Cheers.