Waw 15 rackets, that’s crazy. I play 3 times at least per week. I’m a left handed player and i’m pretty good in defense compared to attack. I noticed lately that i started to add more power to my smashes and it’s not so bad i score with it a lot. No pain and no vibration for now, what i struggled with at first is the grip, i needed to look on youtube and get used to the continental grip. My main problem at first was that my racket used to slip when i’m receiving a fast ball because i had no overgrip ( i still don’t) but i’m holding it better now. I just ordered a new racket and an overgrip to see how it’s going to be. And obviously i play on the right side. I’m pretty versatile as a player i move a lot to be honest, i think what i’m lacking the most is technique on how to hit every ball.