Tight on the bars comes in 2 forms. Stiff arms and shoulders and/or a tight grip. Both make the rider work harder instead of letting the bike do the hard work. In many of my pics, my fingers do not completely wrap the grip. It's another form of receiving to much input. The tighter your grip, the more vibration ya feel.
adouglas has a good point about the stock bars. They suck for trying to get into great bp. I have them on my race bike and I hate it.
