My chatGPT struggle was with with reducing Response Lengths from "short essay" to "be brief and concise, without echoing past info unless necessary". In it's last response, chatGPT thought a bit, sent 2 sentences to say "Sure, I'll do that", plus a sentence fragment. It then stopped to think, erasing the sentence fragment.
A CSS element somewhere shifted violently, as it adjusted to a shorter-than-expected paragraph.<p>I thanked chatGPT and left, and the next chat was, predictably, back to essay-length responses.