I'm thinking about the new Thieves Guild Armory Station in particular, but the beauty of this guide is that it can be applied to anything with a low spawn rate with a high demand/traffic farm rate. You know the drill. You want a new sparkly item. You logon to farm it, but there is nothing to farm as it's already been farmed and the spawn timer isn't up yet. This is where my guide will help:

Step 1) Wake up at 4am
Step 2) Logon
Step 3) Farm

Congratulations you'll now have your desired item much faster than with other guides.

I'm being somewhat flippant, but my point is a serious one. If you are on at primetime and you are farming these antiquity leads, you are likely in either Hew's Bane or Glenumbra because those are the two zones that it is widely known for sure the leads drop from Thieves Troves. If you are 0.1 - 14 minutes behind someone else on a route you won't see any Thieves Troves. The more people, the worse this problem gets.

Putting all 5 leads behind the same drop source, as well as letting players discover where that source is for themselves, leads (pun intended) to this kind of problem. If @ZOS are going to do this sort of thing, with multiple leads all dropping from a spawn limited source with a long respawn timer, then they need to speed up the respawns ... or you know, don't put them all behind the same source in the first place.