Thanks valtic for the great post and images. I plan on trying but want to avoid creating bricks and have a few questions first:

I don't have the advance config voltage setting (I assume it should be under Miner Config -> Advance tab with freq adjustment).

Do I need to upgrade to antMiner_S320141013.bin and then to antMiner_S320150109.bin (latest) or can I go straight to the latest firmware?

Also, any advice on things to do before and after firmware update to avoid bricking?

On the Bitmain firmware page it states the latest firmware "disable VDD adjustment function".
Does that mean it gets rid of the voltage adjustment or am I missing something?

Also I thought when you changed the voltage setting in the advanced tab that you were changing the chip voltage and we didn't need to do the hardware mods as we did on our S1s. Can someone explain?

Also what do you mean by
parallel 2.2k resistor on VFB to Vout resistor
.68 for 2.2k
.75 for 6.8k
Do you mean we get 0.68v if we parallel a 2.2k and we get 0.75v if we parallel a 6.8k?
or are you saying some S3s have different resistor (either a 2.2 or 6.8k) that we will be paralleling with
Do you mean we get 0.68v if we parallel a 2.2k and we have a 2.2k and we get 0.75v if we parallel a 2.2k and we have a 6.8k?