"Epicurean Kinetics" by Norman DeWitt

This may have been what DeWitt had in mind, although he was not so clear:

"Cicero's prose is in fact a joy to read, and he leaves no question that he knows it. He is also admittedly correct that Epicurus' Greek is turgid, clumsy, and sometimes almost barbarous. I once spent a full day translating Epicurus in preparation for a stressful job interview, and by the evening I was on the verge of tears." [Austin, Living for Pleasure, pg. 97]

It seems to me that this is one of those things about Epicurus that we need to find a way to educate people to very early in the process of reading most all of Epicurus' letters, and even the Principal Doctrines and Vatican Sayings.

The Epicureans were philosophers and it seems most of what survives is pretty high-level material intended to be general in effect so as to sweep in the maximum possible number of particular instances. Cicero's giving us the key with all of his complaints about Epicurus talking in an idiom of his own and ignoring standard terminology.