Not sure if you will ever read this, but I was pointing the light resist thing out coz this wasn't the first time I've seen you doing it, and the resist down effect of elemental resist down is often overlooked. And the reason why I started to get overboard is that instead of admitting that it wasn't the best move, you went on & started to make your own mistake justified. The multiplier of Tsuku's nuke without advantage is something like 1.5x.. why bother increasing that instead of your chances of landing debuffs?
Not playing optimally is one thing. Deliberately going against it and even trying to justify it is another.