I'd go along with this, but also try to squeeze in some concentrated listening time., using headphones, as Kate suggested, but really listening out for every word, and even if you can't identify words, being able to spot beginnings and ends of words is good (and Radio Cymru presenters tend to be pretty clear speakers, I find ... phone in guests less so!).
If you haven't used it, there is the BBC iPlayer Radio App that one can use on smart phones or tablets. You can listen online when you are connected to wifi, and also download programmes to listen to offline (for a limited period, something like 28 days).
For programmes, as well as the Pigeon podcast, I'd suggest browsing through the Radio Cymru schedule (which you can do on the iPlayer App or on the RC website) and seeing if anything takes your fancy.
One regular weekly programme that might work for you, as a southern learner, might be:
Dewi Llwyd is a southern speaker with a fairly relaxed pace of speaking, and the whole programme (which goes out on Sunday mornings) tends to be very relaxed. There are some musical intervals, but it's mostly conversation (which is probably more useful to you in this context).
Of course, with iPlayer, you can listen to it at any time, not just on Sunday morning.