Considering there was a post about possibly not having enough pillars followed shortly by a post about having too many pillars, I'm guessing it's probably just about right. And sure enough, it's a fairly common occurrence that in the crucial early stages of a battle you will find yourself with just barely enough quanta coming in to play stuff as you need it. More often you'll have a little bit of excess (which will turn into a lot of excess as the fight goes on, but that's okay because if you last that long you've almost definitely won--assuming you are not foolishly trying to tackle a Feral Bond god, anyhow), which gives you a bit of a safety net just in case.
Swapping in a few pendulums would definitely help your case against denial gods (who tend to shut down your
much more easily) at the cost of being a lot worse at facing heavy rushes. Considering that you can easily milk some of the rush culprits, and most of the denial heavy gods will shut you down even with some extra pendulums, I think it's probably not worth the switch.