Upon forther research, the TControl550 does indeed suck balls.
Looks like a marketing scheme to me! I would go with the standard Antec vmod for your psu. You should have a sense wire for all 3 rails running down the length of the ATX connector.
You can always PM or email me if you have any questions. If possible, send that damn TC550 back and get a refund...buy either the TPower550 (its hella cheaper than than the TC550), or the TTGI that was reviewed by OPP.
Both are easily modded, and I think that after taking the cover off the TTGI there are actually installed pots to tweak!