Ghetto cooling duct here again.

Hard a go are re-flowing the solder on the USB hub that had about half the sockets not working and gave it a +5V power trace augmentation, but I think I may need to replace the sockets.  Or wait until I have a reflow workstation (thank your element14 Father's Day specials).  Also ran into problems with comms errors, decided I should measure the +5V at one of the miners, it was down to 4.90V at the miner, with 5.16V at the PSU, so I adjusted the PSU voltage up to 5.4V (5.06v at the same miner), and the comms errors stopped.  Two more hubs on their way from DX.com for modification (along with some 3300uf 16V caps to repair an ATX PSU with a 45A 5V rail), though I may just get a 5V 30A supply instead, since the voltage can be adjusted up to compensate for ohmic losses.