Mattaios as in your other recent post I removed the fonts and colors for readability's sake.
I am going to have to wait to add other comments, but I do want to go ahead and say that I don't recall thinking that Max Radin's book was a particularly helpful interpretation of Epicurus. It has been a long time since I read it and I would have to go back and review before I could comment more directly, but in my early days of reading Epicurus I found that book to be something that I wouldn't recommend to anyone trying to understand Epicurus.
Your quote where Radin is putting so much emphasis on chance strikes me as an example why I didn't like the book. I had the same reaction as you are saying -- Radin is overstating the role of chance and seemingly approaching the issue in a way that I suspect Epicurus would strongly disagree. Certainly there are circumstances we do not have control over, but the perspective Epicurus stresses is that we can and should act to steer our lives as best we can, as stated in your quotes from Epicurus himself.
Since you have just read it please feel free to discuss any parts of Radin's book that you would like, and we'll probably set up a thread on that book if we don't have one already and move this discussion into it. The book is well known so it would be good to have a thread where we discuss its shortcomings (and any good aspects, few of which I can currently recall).