Yeah, like I said, once I put Kylo wandering through the snow at the beginning in, his line ideally won’t come in too soon. He hears a Sithy whisper, and this puts him on edge as he goes deeper.
A hypothetical first-time viewer wouldn’t know it at the time, but I chose “You are unworthy” because it is meant to refer to the idea that Rey is possibly the superior heir to the Sith throne, at least in Palpatine’s mind. I think it’s best to leave it vague so we can keep that.