how we parallel - My reference for Tennis which I got for my son is 'How to Play Better Tennis' by Tilden! His team is full of the strong western grip, loopy forehand and 2 handed backhand crowd. They all play the same and they are all used to playing against the same by and large. My son did not have the strong grip and by the time we'd finished he had a good basic drive but his shots (like mine) stayed low. That strong western grip is not so easy on low shots
I think that was a big part of his record.
We did find a local tennis place that was better though they still did not focus on the basics to my satisfaction but he was getting those from me and the new place was more physically challenging.
Peter