on i/o shots the elbow is too close. on cc and up the middle shots the elbow is way way too close. You're losing leverage, power and control. You also use too much arm during the swing. the body is barely involved. you should be able to hit 10-15mph faster easily with the same basic form you have now.
Yonex VCore 100s - SW 351 6pts HL
Tour Bite / Luxilon NG 16 @ 51lbs