If you do a lot of research about KOPS...you will find that strong riders tend to want to be in front of it and weaker riders behind it. Sheldon Brown writes about it.
For all you guys that discount conventions...conventions come into being for a reason...they are norms extrapolated from the masses.
Do they work for everybody? No. I am right around KOPS and when on the hoods, my handlebar obscures my front hub.
So these conventions work for me. I don't set up to either but that is where I end up for the best combination of performance and comfort.
Also..regarding the Lemond seat height convention or formula of .883 X inseam...I ride with a lower seat than this.
So his formula doesn't work for me or comport with a 25-30 deg knee angle at the bottom of my pedal stroke either. Conventions are a good starting point then thru trial and error find your best fit.