My technique is to retard the thrust levers to idle just after the "50" foot call. I tend to apply a little back pressure at about 30 feet to slow the descent and the rest of the flare is a reaction to the resulting descent rate. A slight relaxation of the backpressure just before touchdown can soften the landing as well.
I would pay attention to where you find yourself looking during the flare. I was having landing issues and found that by making an effort to focus further down the runway, I am better able to judge height and sink rate. Also, prior to landing, consider runway width as it relates to illusions (narrower than normal makes you feel higher than you are and flare late, wider than normal makes you feel lower and flare early, etc).
Regarding BelArgUSA's suggestion of disarming the Autospoilers (if you have them), I have never noticed that their extention causes hard touchdowns.