I think Ive realised what Ive done wrong here. (the alloy racket is a Prince Titan, one up from a recreational racket. Decent, but of alloy composition).
Because I like a leather grip, I added one to this racket and I think by taking off the synth grip I have removed any remote part that provided a little shock absorbtion and the racket has just rattled my wrist and shoulder.
Time to upgrade to a racket that has decent control and of moderate weight, I think I'm going to try the Dunlop 300.
"Tennis is just chess with balls."
Sometimes: Dunlop Biomimetic 300 - Sometimes: Prince Exo3 Graphite 93