As someone who made his fifth AFF jump, was off-radio*, and landed it cleanly for the first time, I can tell you what worked for me.
I flared too high on all of my previous attempts, so this time I simply got to the point where I felt I should flare, and waited two more seconds. I figured that flaring when I was comfortable had failed four times in a row, so I would have to break my comfort zone and get lower than I wanted to before I should flare. That, combined with the fact that my AFFI told me that I should feel like I was low enough to kick a tall person in the head, helped me muster the courage to 'hold fast.'
When I got to half flare, I was so happy to be skimming just above the ground with some forward momentum that I forgot to complete the flare and ended up running it out.
*Before someone shits a brick because I was a student without a radio: I had a radio, but was allowed to fly my own pattern and land on my own)
