Depends. Are you using liquid Kolsch yeast? If so, leave it the way it is, Kolsch is supposed to be a semi-lager. Light, simple but with nice fruity flavors from the yeast. Not bitter and not really hoppy at all. It requires the proper yeast to truly be "Kolsch"
Dry yeast? your not making kolsch anyway, so do with it what you want
To my knowledge there isn't a single dry yeast strain for Kolsch!
I'm just going by pure style guidelines here. You simply won't make a true Kolsch without wyeast or white labs Kolsch yeast. I have 10 gallons of Kolsch fermenting away as I type, my brother and I brewed yesterday