Like I have said, these amps so far, have never quite done everything I have hoped. It has never been a fault of the transformers. They have great extension. I have had wonderful bass, shimmering highs and liquid mids, just not always at the same time.The Current project is showing good promise. Once (if ever) I get a baseline circuit I will experiment more with the transformers.
In the mean time, to answer some of your questions. When I first built these they were a direct copy of the FI primer. As my speakers are 16 ohm, I set the transformers to 3.6k-16. I later changed to 5.6k-16 so that I could connect 8 ohm speakers. At the time, with the rather soft sounding topology, I did not hear much of a difference between the two tappings. As I do not seem to need every last bit of power , I have left it there. I still take it to meetings were 8 ohms is the norm.
These amps are once again in a state of change, no thanks to you my friend. 
It will be some time until I can get back to transformer experiments.
But I do have a set of James transformers and maybe a set of ElectraPrint to try. So ‘don’t touch that dial’…John
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