Mr. stevecham
It is not me to invent DF or plant it into your amplifier you already
own. If your DF is achieved by feedback, it is the amplifier designer and
maker's choice and not mine. This thread is not about modifying a given
amplifier's DF to make you happy. All here have an Amp. with a given DF, whatever
it is.
There is nothing wrong if a well designed amplifier has a high DF even
if it is achieved by feedback. Feedback is not a bad word. Some excellent stuff
out there is just made like that, to include the M1.
Whatever you like it or not, getting a cable by others experiences (more
or less, whatever they might say) or by a listening judgment is so wrong. A
speaker cable shall be tailored by the amplifier it is connected to, with
calculated values and characteristics. Not empirical guess or a blind listening
cession. Sorry if that is against your convention. See no issue for you
to try it and hear it by yourself. For those who already did, it is a win-win
situation.