Actually, I would say the complete opposite. I prefer to only have the cherry in the middle, so that there is tobacco surrounding it to push the flavorful oils from the leaf into the smoke, for more flavor, since the actual burning leaf doesn't have much flavor. I only maintain this by smoking very slow. I notice that if I start to push my cadence a little too hard, the cherry goes out across the whole diameter of the chamber, where the smoke is hotter with less flavor.If it is only burning the center chances are you are still smoking too fast, creating a heat center. Tamp those pieces in but slow your cadence and see what happens.
But, this is just my experience.