I'd suggest, if you're already receptive to these concepts, to delve into Buddhist/Zen Buddhist/Taoist literature in addition to the more cerebral (pun?!) stuff out there. They're basically saying the same thing, albeit with much different language and framing. In particular the notions of interdependence, sunyata (my personal favorite idea/concept ever), and duality(ies).
Beyond that, unfortunately most of my exposure to the ideas related to panpsychism come in fits and bursts, and usually pieces which aren't about panpsychism inspire my ponderance more. Subjects include: animal consciousness/experience; the apparent intelligence of complex systems, whether man-made or independently-arising; autonomic, pre-conscious behavior in humans; computational theory, especially in physical systems; emergence and complexity writ large; complex adaptive systems in general.
Unfortunately I haven't done a lot of seeking out books on this topic. Nautilus and Aeon magazines (the latter is linked in OP) have thought-provoking stuff which touch on these topics more often than you'd think.
Do you have any other suggested reading?