I don't know what horn you played before, but it could just take a little time to adjust to the sound and feel of your new Schilke, especially if it's very different than your old horn. It's also worth checking to make sure your mouthpiece fits correctly in the new horn. I've had a couple mouthpieces that seemed to fit fine in one horn, but wouldn't fit snugly in others. It's not particularly common, but not unheard of to pull out that far. If you sound good and play in tune, the horn is working fine for you.