Clive,
Sorry you're having such a time. I haven't seen the HD so can't comment on color fringing or coating appearance, but I have owned three Leicas, a BA, a BN, and a BR, and would like to comment on the issue of the notorious juddery focus. (I am an American, and only know the word "judder" in its relation to Leica binocular focusing!)
Peoples' description of the focusing action on their Leicas is so all over the map! Some folks have had several and claim all were smooth as silk, through those who had a problem that was corrected, those whose focusers started out smooth and got rough, and those whose focusers who started out rough and got smooth, right down to those who have tried several and hated them all. Is it people, the binoculars, or both, that vary so wildly?
Well to qualify myself as having experienced a focus that is almost universally agreed to be extremely smooth, I have a Zeiss FL. Its focus action is remarkable, in that, although the knob is not particularly effortless to rotate, there is almost no "sticktion", or static resistance that must be overcome before the motion begins, which then requires less force to maintain, than to initially set in motion.
All three of my Leicas have been about the same, with considerable sticktion. When i use one finger and barely push the knob along as slowly as I can, indeed, it jumps along in little steps of a few degrees, eck-eck-eck-eck-eck. Perfectly horrible, you could very well say.
The funny thing is, in the field I have not the slightest problem with it. I think all it is, is it requires a different technique. I put two fingers on the knob, bear down like I mean business, and apply some force, more than enough to get it going, to the thing. Once it starts moving, it takes some finesse to keep the speed of rotation moderated, but it's not hard to do, it just takes some finger muscle. Keeping a good squeezing force throughout the operation seems to help. They seem to cooperate nicely with this "macho" approach. Once mastered, there is actually an advantage to it, which is it encourages rapid focusing and getting down to viewing, rather than micro-rocking the focus back and forth and straining the eyes to determine the very best focus point.
I am guessing a competent tech at Leica must have picked up your binocular, gave the knob a go, and said to himself something like "not a problem here, why do we get so many complaints about these things?"
So I fear that what you are describing is probably only consistent with typical Leica behavior, and that if you can't adjust yourself to it, you might just have to give up on it, or else have to "bite hard" to get what you want. You might be able to convince them to not merely ascertain that it is "normal", but to put some serious grease in there so it will suit you better.
Some of this was sort of hard to put into words. But I hope it sheds some light on what you may be up against. You need to make it very clear to them what you want, which they may regard as out of the ordinary, I'm afraid.
Good luck with it,
Ron