KOPS is a great reference point. Not a golden rule. If you want to go behind KOPS then by all means position your saddle behind KOPS. Definitely more comfortable. I think that recreational riders should be setup behind KOPS as a matter of course.

Now the catch to being behind KOPS is that your leg angles can close up a little making it harder to spin high cadences. Being in front of KOPS opens your leg angles but places more weight on your hands and shoulders.

KOPS is a balancing act that seems to work for most but certainly push your saddle back and see what its like.

Anthony