You are wrong, the 5.5A-Limit was never changed (only the reserved pin is now also declared as 12V), it is existing since 2005 (version 1.1). And to be honest: 5 x 1.1 A are 5.5A and not more. The voltage (and their tolerance due the ATX specifications) is here totally uninteresting (as I wrote), the limit is set only to
CURRENT without any tolerance and not to power draw as procuct of current and voltage.
If you read the Chapter 4 of the CEM carefully you will note, that the 75 Watt limit is only valid in the case of an maximum overvoltage on all rails, nothing else. This doesn't mean, that you can serve generally 75 watts, also if the voltage doens't exceed the 12 or/and 3.3 volts. This is totally wrong. The table in 4.2 is based at the limits of 4.1.
The short piece on page Two is from the current PCI SIG, provided in a guideline from Hewlett Packard. I especially asked two mainboard manufacturers and one OEM für plugs and sockets. Current, not wattage. Why? The limit was defined for cooling purposes, the contacts itself can survive 3A or more without any technical problems. But only the current is the reason for heating, the voltage is totally irrelevant for this. The approximate value for this are 55°C (PCI SIG), that must be cooled over the PCB
This is from my sight the only one thing that can be a problem, because the PCIe slot has inner temperatures of 70°C and more due the heat from the VRM section, directly above. The heat is wandering from VRM through the PCB and we see no cooling effects. But there is also a very large headroom. The most of OEMs specified their contacts for 3A or more and higher temps to work properly. Simply try to read their datasheets and certifications.
This is from one of my German colleagues and we are in a closer contact since a while because he is figuring out this things on the practical way. I hope, his English is understandable:
https://www.youtube.com/watch?v=TF57OZoJ8M8