Overclocking advice needed

[what to do sia]

Hi, running a i5 3570k overclocked

current specs
3570k @ 4.2ghz
idle 40 - 45
load 63 ~ peak at 70
vcore 1.184, on offset mode -0.050. using asus p8z77v
LLC medium.

what can i do to further improve my oc, lets say if i want to push a little further to 4.4?

overclocking for sake of video rendering and got no budget to upgrade to newer gens thus attempting oc

 

[avsquare]

up voltage lor?

1.184V @ 70c peak you should prob still have headroom to OC