Tbh aiming for nuking sets on NIN was kinda... I dunno, stupid? Pointless? But back then I didn't have mage jobs and started messing up with the idea of using NIN as a "light nuker", so I developed a build with atmas, gear and nukes.
Not comparable to a BLM of course, but it was pretty fun, decent damage. No big spikes except with Futae Hyoton:San, but very constant stream of damage and an entertaining variation from the usual DD melee mechanics.

Nobody trusted me when I proposed friends to let me go NIN/RDM for those fights where they wanted me on a ranged/mage jobs, but the few that allowed me to usually were positively surprised :P

But anyway, those days are over and really even back then there was little point to do that much work for a nuking set. I have to say though that I enjoyed those few times I managed to put that setup to work