We need more logs added to extreme modes?
Use Kings Yield or alternate skills to increase gathering capability.
Is that what was happening in Voidwatch?
First up, in order to be able to see the new gathering point at all there is a particular skill you have to activate.
Even when activated the gathering points for each of the rare items only pop at certain times of the day - high level gatherers have already charted the times that the pop happen for each item and so we know where you have to be and when. I also believe that you need to have gathering stats of a certain level to be able to see the nodes (unconfirmed as I have pretty high stats with good materia). You will also need sufficient GP to be able to use these skills.
So, rare pop - then activate skill to see rare nodes (if you have sufficient GP), then get to the node and activate skills that either double (or triple) items obtained by gathering (again - requiring GP), or activate skills that increase the number of gathering attempts you can have.
It seems (again unconfirmed) that you can only gather at the high level points 3 times before they all disappear again and you have to wait til the next day (Eorzea time). once you have gathered from a point, it disappears and does not repop in the way that lower level gather points do.
All of the above is based on my level 50 gathering with my legacy character. None of it is certain as I did not do much but certainly was my experience. I stand to be corrected if anyone did more gathering than me in beta 4.