After a lot of frustration I think the main problem was that I'd pinched the tines slightly so all the glitter was piling up in the tip of the nib, blocking it. I pressed on the nib a few times to splay it and now I'm back to my desired "All glitter, all the time" state.
Fountain pen question. I'm using a glitter ink, and about two sentences after I fill it, it dries up hard. I can fix it by pulling the feed and soaking it in water but is there something less invasive I can do instead?
TWSBI Swipe, stub nib, piston converter, Diamine Arctic Blast.