results can vary from environments (on desktop or in real environment, presence of others 2.4g protocols, less range with others nrf24/nrf5 tuned differently etc). easier to check with a VNA (a true one). but if it's only for your personal use and range is enough for you, great.
if you take a look in nordic's forum you will get explanations how parts should be routed close to the antenna pin (like the pic I showed you from datasheet). even if onchip balun.. (it won't prevent harmonics)
I meant width of the rf feedline trace. you don't care about the length (what calc did you do for length?). well, actually, you must care, when long enough, you definitely need the right route width, for the impedance matching to 50ohms.
From the matching network(inductor+capacitor which should be as close as possible to the ic on your board..) to the antenna or to pi network, for a 1.6mm 2layers pcb and 10mils isolation, calc for route width should be approx 60mils..
about bom, imho, I prefer to order crystals, 3.9nh inductor and small cog.np0 0402 capacitor from known sources, so I'm sure they are not out of specs. especially the crystals for reliable freq&communication