Actually the racket I made the test on had older grommets but I doubt it would matter.
EDIT: I also did some tests once on a Prince O Port racket with nice smoth painted surfaces. The greater the bend the more the tension loss.
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