'Faithfulfather' I think you are on the right track. Centering the billiard posts on the turntable produces the same angles - friction - tension in the top as you have on the bottom and a more symmetrical string job.
When you're dead you don't know you're dead. It's the same way when you're stupid.
Balance - 31.0 cm, Weight - 358 g, SW - 346 Kgcm^2