so I felt it was right to allow a generous margin for error.
Good job DB, you're right, minimize risk with good judgement. You can help yourself in this theme next time by stating, and then aiming for, a distinct feature a little bit down the runway. The piano keys are an example. "My planned touchdown point will be the far end of the piano keys", which will what you will then be judged on, and... you'll earn a point for thinking about keeping practices appropriately safe, which still demonstrating the objective.
If the engine actually sputtered during a misjudged gliding approach, and you had been aiming at the exact hedge, you went through it for no good reason for a practice exercise.