Maximize your HCI, and add some HLD. Once the HLD goes off, you will always hit, so you will achieve perfection. The mace-and-shields glasses are good for this, which is why they are so popular.
The previous responder is correct. To achieve perfection, you need to hit 10 times in a row. Every hit = one perfection "point" gained, every miss = three perfection "points" lost.
Perfection doesn't affect PvP, only PvM. If you are killing your monster in less than 10 hits, you will never achieve perfection.