This constant angst over a few GHs is so pointless. Just let these things run and quit wasting your time and energy trying to squeeze out (literally) a couple of extra pennies. Downtime from messing with settings and firmware and reapplying thermal paste is doing more harm than good to your earnings.
I agree... I used to have extra exhaust fans on my s1's til I realized how pointless that was and just wasting more power. I don't know why people waste so many hours re-applying thermal paste,etc.. for a few ghs and also the wasted mining from downtime.
I do think there is nothing wrong with oc'ing, upgrading firmware, and updating cgminer. Those things are really easy and don't require too much tinkering. Also with the updated cgminer, the webui is much more responsive due to reduced load.