Hi guys. Back for a little while.
I’ve taken your, greatly appreciated , advice, burnt another copy at 2-2.4x in Clone DVD and run some more tests, images of which follow.
By the way, you are right about the 1x speed not really being possible although selected, as the difference in time between the two speeds was only about 12 minutes (30min at 2-2.4x).
Before doing anything else, I’ve read the Nero CD-DVD Speed tutorial (thanks to Geno888 ) and also downloaded its latest version (which surprisingly seems to be kinder to my burnt media ).
As you will see, these images perfectly illustrate the validity of all your comments. Look at the disc quality score in comparison to the rest.
My final and most crucial question now is: Given my hardware and media configuration and also considering the fact that the disc plays just like an original in my dvd player, should I only perform and actually trust the Transfer Rate Test from now on every time I burn a disc and is this enough to ensure, within reason, the quality or success of my burns?