I've never done the math on it, but I remember back in the t50, every farm was 18x pillar 6x rare 6x another rare, which is why I mentioned it. It does seem like 24x pillar 6x rare would be better, but without knowing the math behind pillar spinning, it's impossible to say for sure. I'd suspect 24x pillar/6x rare is better, but as I mentioned, absolutely everyone did 18/6/6 split for t50 farms.