Best thing I've found to do is simply ignore the light farm entirely. These glamour sticks are not worth the time and effort require to try to make them "viable". I've had all Suzaku weapons for 2 months already, which are more than enough to clear all content currently in the game.

I'm admittedly salty because I've throw 15-20 rerolls at my first weapon (WAR) and haven't even gotten remotely close to what I'd consider "reasonable" numbers (400+ crit, 700+ substat total). Perhaps my expectations are way too high.

I picked up my second Pyros weapon (MNK) yesterday and it'll remain with zero substats forever. Same with any other SB relics I work on in 5.x and beyond. Can't be bothered to touch Pagos until they destroy that light farm with the nerf bat.