I just bought a color-headed Beseler 23CII. It has the color knobs on it. That's exactly how much I know about it; I don't suppose this thing does 4x5? It's huge compared to my Omega Concept 6 enlarger.

Or, you can purchase yellow and magenta CC filters and stack them in your filter drawer. You get 5-point precision that way, while with a color head you get 1-point precision.
So you are saying that the color filters is actually more precise than using a color head?