Good result.... I used exactly the same online resources.
Have you tried the Interrupt driven examples yet? Handy when you want confirmation that a message has been received.... I want to use these to send notification of one-shot events (cat-flap open, pir triggered, bomb dropped, etc) so, as a test, I left a pair of these chatting to each other overnight, one message every 300ms with a small oled displaying message counts. The result was that about one transmission in six didn't make the trip, probably a result of my shocking code as distance didn't really affect the result. Easily fixed though by checking for failures and resending.
Great little modules despite their annoyingly breadboard unfriendly footprint. I splayed the pins out on a couple and soldered them to some IC sockets to use them directly on breadboard. Cheap and cheerful fix. :o)