So, anyone else know of any similar things to do, to get back to optimizing for being smart instead of for seeming smart?

Tentatively offered: Learn to distinguish really understanding a thing rather than just knowing enough to talk about it plausibly. I'm tentative on this one because I'm not sure how to formalize the process, but I suspect the latter is a real temptation for me.

Not tentative at all: Keep track of how you learned what's in your mind. Even if you can't remember an exact source, learn the difference between "I experienced it", "it was in fiction", "I checked it carefully", "everyone says so", "I heard it from a trustworthy source (and why did you think it was trustworthy?)", etc..