Thank you, Cassius.
You did recommend me to carry on with DeWitt after Lucretius, rather than searching for subtopics. I am going to follow your advice as soon as I can. I agree, DeWitt is the best option to start digging into Epicurean philosophy.
In the meanwhile, I enjoy the episodes very much, it's a rich debate about subtopics. I do like Joshua's participation, I can't get enough. I came across analysis and comments about Epicurean view on death in the last two episodes, very interesting indeed, a subtopic that appeal to me.
Also, the view on happiness/pleasure even during hardship comes handy to me right now due to negative circumstances. I am facing adversity (accommodation, finances) so I am under pressure. I have to deal with it. Therefore, I have no choice but let DeWitt aside at the moment. Nevertheless, I find a certain degree of sanity (happiness/pleasure) when listening to the podcast every week. I forget about adversity for one hour. I might be applying Epicurean principles unconsciously, who knows. I've just realised that I am participating in this particular forum, asking questions and so on, despite the situation; a bit strange to be honest.
In the near future, once I find myself in a better position, I go for DeWitt.
Thanks for the comments and advice Cassius, I appreciate it.