Can't speek for the 737 but on the DC-9 we add to Vref the greater of; all the gust, half the steady state winds greater than 20k, or 5 knot. In any case don't exceed the orginal Vref + 20 knots. The head wind componet is compansated for in the landing distance chart. We carry this speed to the flare.
I find if you accuratly aim for touch down spot, don't carry power though the flare (reduce power at the correct point)and don't try for a "greaser" you'll do just fine.