Why do complex roofs and odd sites still trip me up?

You said it plainly: you can handle most systems now. The complex roofs and the odd sites are what stop you. That is not a small thing to admit. Most people hide behind vague words. You named the exact edge of your skill. Here is what is happening. On familiar jobs, your hands already know the pattern. You do not have to think. On the odd ones, you invent a plan in real time. Inventing under pressure is where mistakes live. This is not a talent gap. It is the absence of a fixed process for unfamiliar ground. You already built a repeatable method once — for standard roofs, whether you noticed or not. Now build one on purpose for the odd cases. That is the whole task ahead.