A break??? Are you mad!!! NEVER!
I wasnt sure if I was over-swinging or trying to swing too hard to generate power. Down the side of my back feels strained too. I know my technique is not perfect, but it has got a lot better in recent months, so I dont think its that.
I think I will rest during the week and do a few light weights, then see what happens if I use the 93.
I'm wondering whether the feel of the racket on impact with the ball is having an effect, with the fact that the better quality graphite in the 93 is dampening the vibrations I'm getting with the alloy.
"Tennis is just chess with balls."
Sometimes: Prince Classic Graphite 100 - Sometimes: Prince Exo3 Graphite 93