To think it's a feeling is a error. It's not always a feeling it's seeing words as you superread and noticing the ones that want you to slow down and read.

It can be more of a recognition that goes hey I know you.

Some reasons you don't get the feeling to dip,
you haven't asked a question -check your trigger words have a question in mind
You're not interested in the subject - build your curiosity by strengthening your purpose, be playful.
You're waiting for a feeling and ignoring other signals to dip. It's not always a feeling it can be the voice in the head that says dip now. Words can glow or just attract the eye. You might even be ignoring the internal message that say go back you missed it - just ask where and then go back where your instinct takes you.

Alex