Yes, buddy...
This is what I am doing first...test them as they come...stock...no mods...@850MHz ...to check how good are they...each one...

Second...: Apply the thermal mod...Paste...new, thicker, better thermal pads...shims, if nesessary...TEST again...Most of them are going to 950 min...1000Mhz...NO volt mods yet...!
Out of 10 => 4 @ 1000...4 @975...1@950 ...1 slacker @925MHz ...NO HW errors...this is my belief that every HW error is lost...non submited...unpaid work...this is like your miner STOPPED for this period of time...5-10-15 min...so I opted for NO HW errors at all...
Voltage mod next...I am using my own...Test again...etc...
Capisco...?...

It is just me...you could create your own test/mod...
Cheers...Beer here...
Thanks for the response ZiG, I will be more than happy to take some screenshots of cgminer before and after to post and let everyone know the results I was able to achieve with this mod.
Just so I'm clear, you remove the existing thermal pads/paste, clean the unit with alcohol and then apply paste to the chip and bottom of the heatsink with the copper shim or new pad sandwiched between?
Exactly...
First is the bottom...with the golden pads...it IS MORE important... the chips are designed for proper cooling from the bottom...made like a metal heatsink ...soldered to the printed circuit board...Thermal paste is probably enough @ bottom...
Next is the top... Here using Pads ( and/or shims ) as needed...to compensate for the higher components...
Pics and results are greatly appreciated...