That sounds like a good timing strategy on PS5. By the way great work for taking the 3 WR.
Also, I can't answer to your message because my account is not 7 days old yet. But I can help you with the moderation (and it will be a pleasure to review your runs).
So far my "timing" was quite imprecise. I mean, my improvements were always several seconds. For the beginning, the music is a good landmark. And you don't have any control during the initial fade-in. So that totally makes sense. And the timing should end with the last input. For the any% the last input is when the last text box goes away. For the "all hat", you have a last "z" to press after the last text box for the fade out. For the "all perils", the timing should end when you get the last "status" change.