You say you are aware of all the relevant LW posts. What about LW comments? Here are two quite insightful ones:
My most easily articulated problem with CEV is mentioned in this comment, and can be summarized with the following rhetorical question: What if "our wish if we knew more, thought faster, were more the people we wished we were" is to cease existing (or to wirehead)? Can we prove in advance that this is impossible? If we can't get a guarantee that this is impossible, does that mean that we should accept wireheading as a possible positive future outcome?
EDIT: Another nice short comment by Wei Dai. It is part of a longer exchange with cousin_it.
CEV is our current proposal for what ought to be done once you have AGI flourishing around. Many people have had bad feelings about this. When in Singularity Institute, I decided to write a text do discuss CEV, from what it is for, to how likely it is to achieve it's goals, and how much fine-grained detail needs to be added before it is an actual theory.
Here you find a draft of the topics I'll be discussing in that text. The purpose of showing this is that you take a look at the topics, spot something that is missing, and write a comment saying: "Hey, you forgot this problem, which, summarised, is bla bla bla bla" and also "be sure to mention paper X when discussing topic 2.a.i,"
Please take a few minutes to help me add better discussions.
Do not worry about pointing previous Less Wrong posts about it, I have them all.