Really sorry for the noob question, but is there an element of RNG in using Field Mastery on Unspoiled nodes? Twice now I've used Field Mastery 3 and it's stayed at zero Or is my stats somehow factored into this as well?

I've just turned 50, I'm lucky enough to afford a few pieces of decent gear, everything is unmelded at the moment. I'm working on getting the melds to add at a later date.

Gear is: - Hamlet Hat, Botanist set, Dodore Choker, raptorskin belt and rings, militia bracelets, rose gold earrings of gathering. Main Hand is Rauni and off hand is militia scythe, so... Gathering is at 323, Perception at 332. I should imagine that affects things as well Thank you for any help!