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Where are you located in Shanghai? I play on Sunday mornings 10am-12pm: 上海博宽羽毛球馆 (you can look this up on maps.baidu.com; 双桥路302号 - 302 Shuang...
I believe the "secret" to hitting is the impact point... so the correct stroke is actually what will get you to impart your energy to the impact...