Timzsta, the root of your student's problems may partially be in your technique.
You said "... and you calmly say for the umpteenth time "stick forward, apply power" " - but this does not teach judgement. I respectfully suggest that a better approach (ahem) would be to say "check your speed and correct it" followed later by "is your approach angle correct? ... how can you fix it?". By doing this, and with appropriate demonstrations and breaking-down of the task, the student learns judgement and practices corrections rather than just being an extension of your own approach processing (can't think of a better term).
HFD