Especially for trail center on an XC bike, absolutely put a Slaughter on the rear. Yes you lose braking and climbing traction on wet roots and loose soils, but on rock and hardpack it does fine. Purpose built trail centers won’t have super steep climbs or descents where you need that traction anyway. And you still get the same cornering knobs as the Butcher.
On the front, the Eliminator could be an interesting option instead of a Butcher. It has intermediate knobs, so you get cornering traction at all lean angles, not just when well over on it’s side. This does mean you give up ultimate grip in softer soils, but as you mention a focus on trail center riding, that won’t be as big a deal. Still, if you have gotten on well with the Butcher up front before, probably best to stick with it.