Originally Posted by WildVolley
First, I disagree with your premise, and I find your terminology confusing. Edberg holds closer to an eastern bh grip on his serve than most professionals. Most modern players hold a variant of the modern continental which is index knuckle on the 2nd bevel, rather than on bevel 1, which is closer to how I believe Edberg hits.
In my experience, players who hold an eastern bh in order to hit more spin also shank the serve more. I believe it is best to just stick with continental on the serve and to turn the shoulders away more from the target to hit more topspin.
...there's another aspect of grips in general, which is spread grip vs. hammer grip. Players use the hammer grip, I believe, under the misapprehension that gripping the racket tightly produces more power and control. Actually, the opposite is true: a loose spread grip let's the wrist and hand articulate so that you can effectively create spin (low to high for topspin for example) and produce optimum power with the "whip" at the end of the kinetic chain. A soft grip also allows the player to direct balls more easily...just look at McEnroe, he still has the softest hands in the business, and it's doing pretty well for him these days...