Ken, CG plays a bigger part in the elevator trim remaining constant at different air speeds then thrust line does. For the most part I only adjust thrust line to trim vertical flight. It's a long process and most things will overlap. Sometimes you end up adjusting something multiple times. At some point the adjustments get so small that you need to fly them a couple weeks before deciding it was a good or bad adjustment. There is no perfect setup, just one that has the least flaws.