OK I have re-read the Wenham Article ("On Cicero's Interpretation of Katastematic Pleasure") and I do need to correct what I said above:
I now remember why I find Wenham's article useful, but not in the way of Gosling & Taylor and Nikolsky.
The key point of departure in Wenham is that when Wenham is forced to decide whether Cicero (1) misrepresented Epicurus or (2) misunderstood Epicurus, Wenham departs from G&T and decides to go easy on Cicero and accuse him of incompetence rather than malevolence. Here's the key part - Wenham is sure Cicero is wrong, but the question is WHY:
.... And so Wenham decides that CIcero simply must be wrong. The rest of the article gives his reasoning, which is where my memory was bad. Wenham says (I think rightly) that Epicurus held that pleasure is pleasure because it can be experienced, and so Wenham concludes that whatever katastematic pleasure it, is must be felt / experienced just like kinetic pleasure.
Maybe you'll read the article differently than I do, but where does that leave Wenham in describing what katastemtatic pleasure must mean (under this theory)? I've read over the article several times, and I think he's left right where we would expect. He can't and doesn't even try to define katastematic pleasure as separate from kinetic. All he does is conclude that whatever it is, it must be "experienced" or "felt" because that's the way Epicurus looked at pleasure.
So as I read it this article would implicitly support Don's current position, but I say that still convinced that the reason Wenham stops where he does is that he doesn't follow Gosling & Taylor to the logical conclusion that Nikolsky took them. Wenham chooses to believe that despite Cicero's sweeping knowledge, access to the Epicurean friends and teachers, and Cicero's own training in Epicurean philosophy, that Cicero simply "misunderstood" what Epicurus was saying.
That's where I would say that people should trust there instincts and always beware of lawyers!
And so i take the position taken by Norman DeWitt, another line I haven't forgotten despite my poor memory: "i do not believe he could have misrepresented the truth so successfully had he not understood it completely."