I have reviewed specs of countless amps and haven’t found one yet, no matter if it is called a Class A amp or Class AB that gives you the information you are asking for; rather you will get what each manufacturer decides to give you as your guide. And power is not always the best gauge to sound quality or speaker drive capability.
Best explained maybe by a few examples. PASS Labs calls their INT-25 a Class A integrated amp and it’s rated at 25 amps Class A into 8 ohms. That’s all the power spec you get; yet it does transition into AB beyond that 25 watt limit or at lower speaker impedances (but is doing it AB even if it isn’t stated). The same PASS Labs calls their INT-60 a Class AB integrated amp, with a single power spec listed as 60WPC AB into 8 ohm. That’s all. But that amp is Class A for the first 30 watts into 8 ohm. There are countless examples. The bottom line is a Class A SS amp is going to have some region where it performs as AB and vice versa, just as you mentioned is the case for your Parasound amp. There is no apparent requirement for any manufacturer to give you the data you want to know. Yes it can be confusing at times. It becomes complicated though to know what the power ratings boil down to in terms of the WPC at various impedances for both Classes. So the specs manufacturers give are often limited, but serve to tell you something about where the component’s strength resides. And for the S5.5 it starts with 50WPC Class A in 8 ohms. Where it finishes though is at your ears and from all the reviews posted in this thread, it finishes in 1st place, by a wide margin.
This probably hasn’t helped your confusion on this but is an attempt to explain that you are not likely to find answers to the questions you ask in your post and even if you could, they won’t always relate to how good the component is going to perform.
It was explained earlier that the lower power side of the S5.5 allows the use of some unique transistors which are the reason behind the stellar sound being reported by everyone who has purchased the S5.5 amp on this thread, and these are critical listeners. The eye opening accurate reports of Terry London and all these users carries far more credence than any thorough list of power specs could ever convey (imo). Hope this helps some and any confusion on power ratings is understood and shared by many; however, in rare cases such as this Coda S5.5 thread, there just may be a more accurate criterion to focus on. Like who is winning all the races.