When I was younger I could hit a 7 iron 175 in the air. It's just quality of strike to be honest, and a free swing. Hard swings will do you very little, as the strike is compromised and the speed could actually be lower. Swing free...think athletic, very little conscious manipulation of the club, swinging without much thought...
Irregardless of which hand is placed where, it needs to be gripped in the fingers. Allows for a hinge, and creates speed. It's a bit easier to grip right hand lower, simply because it's easier anatomically on the backswing, and allows the grip to feel more natural.
The Ping B60 is like the Pal and the Anser. It keeps coming back around every few years.
I won a (new) Ping B60 with fitting at a golf shop Christmas party in 2011, and played with it for about five years.