Mr. geoffkait
Directionality can explain nothing. There is nothing in electrical science to explain such a thing in cables. It exists only in audiophiles minds that were talked into it at the time they were set up by the industry, with that excuse. So is the BI (Burn In), metal purity and all that long and annoying list of urban myths.
You better look for the explanation somewhere else. I can give you a hint, but this thread is all about it. Your attitude to accept the truth (especially of the six testimonies of the guys who tried the DIY cables, I offered), is in a denial. I have a bad feeling that no matter how many will say the same, you will stick to directionality.
Just let me say it again: there is no such a thing as directionality, and with something that doesn't exist, nothing can be explained.