The only driver I ever needed to brake-in was a pro-type driver with a laminated pleated surround. They are a little stiff to begin with but after a few hours they became more pliable. You have already adjusted the 1050 to the new drivers, right?

PS. I had the opportunity to see how drivers are made and tested in a factory setting. You would be surprised at the difference between how we treat them compared to how they treat them before they ship them out.