Hi Houdi!
Given the content of your last post on this, I imagine that scrambles are no longer of any great interest to you.
However, I just post this because, partly motivated by your report, I did the Parson's Nose and Clogwyn y Person Arete yesterday,
http://www.walkhighlands.co.uk/Forum/viewtopic.php?f=16&t=43152and now I'm completely certain you took a route way too far to the right, judging from your description of your experience and scrambling skills. The face to the right is full-on rock climbing, and if you did that, I'm really pleased that I read your report and not your obituary!!
I would describe the Parson's Nose as V Diff, mainly because of the shattered rock and the exposure; and what I saw of the standard Arete route as grade 2 scrambling. This isn't what you describe.
Actually there is a reasonably clear path up the Arete, and the route is really straightforward scrambling - so straightforward indeed that I didn't go for it, although I did frequently see it over to my left as I climbed up the Arete. There looked to be many possible route variations more or less in the middle of the Arete like the one I took, and generally they looked to me to be grade 2 - 3 scrambling.
I agree that the descriptions you read are not particularly helpful.
I try to stick to my dictum of being pretty careful not to upclimb something I won't be able to downclimb unless I'm completely sure I know the way ahead (though I've more than once misjudged the relative ease of the downclimb that I then had to do - way too much adrenalin!).
I must say, I had a wonderful morning on the Cloggie: the best possible mix of exertion, adrenalin (not too much!), and spectacular views. I hope you do try your old sport again (BTW I'm also a keen cyclist, so I do understand the attractions of this also: in fact I combined the 2 on a couple of straight line routes this year - best of both worlds!)
All the best
Alter Knacker