I feel like it's largely an effect of tuning it to default as "a ultra helpful assistant which is happy to help with any request via detailed responses in candid and polite manner..." kind of thing as you basically lose free points any time it doesn't jump on helping with something, tries to use short output and generates a more incorrect answer as a result, or just plain has to be initialized with any of this info.

It seems like both the voice and responses can be tuned pretty easily though so hopefully that kind of thing can just be loaded in your custom instructions.