For what it's worth, my whiskey sour reicpe is as follows;
1 1/2 oz bourbon
1 oz fresh-squeezed lemon juice
3/4 oz simple syrup*
Shake with ice and strain into a coktail glass, stright up or over ice.
*I make my own simple syrup, using 2 parts water, 1 part sugar. I find the syrup makes it easier to get a smooth, fully mixed drink.
The result is a nice, tangy sour, with just the right amount of sweentess for my own taste.