You'll see we generally start out recommending the DeWitt and the Austin books, but you are a special case given your reading already and your preference for a more detailed approach over a "lifestyle" approach.
I am sure others will have recommendations, including Sedley's "Lucretius and the Transformation of Greek Wisdom" since you already have some experience with Epicurus.
If you will let us know whether there are particular topics or aspects that interest you most, we can probably fine-tune the recommendations further.