A good thing to do is not to try to land in the shortest distance possible. I have that problem as well... I try to lower the speed so much that often it only takes me a 1/3 of the runway to land. Stalling at that altitude will surely lead to some needed repairs. Learn to use more but still a safe length of the runway so that you can eliminate a chance of stalling. This becomes even more important with other planes that have terrible stall characteristics.

By the way, what is likely is that the wind was gusting and instead of being stronger, it died for a second around your plane. (I assume you are landing into the wind) What this does is dramatically lower the airspeed of your plane, wings lose lift and plane plummets to the ground. If really there was a downburst right as you were landing, I doubt a little throttling up would really help. Those microbursts bring down airliners.