The Korbel is a little better for you than the carbon blade. But not much. It is still too fast. I recommend Stiga Allround Evolution, Yasaka Sweden Extra or Stiga Allround Classic. You should be using something that will help you improve. I know, it is hard to get past your ego saying, "I want a faster blade." But that will only hold you back.
This is a suggestion of something to start with. Most of your "rallies" when you are warming up are 3 hits or less. The points in the games are even shorter before someone messes up. And it is pretty hard to average less than 3 hits.
Get a practice partner. Hit cross court FH to FH and see if you can do 50 hits in a row or more. When you can get 50 hits in a row consistently, then make a video for us of that. Also, it is worth practicing the same drill BH to BH crosscourt as well. With BH, when you can make 30 hits in a row consistently, then make a video of that.
In this exercise while trying to go cross court, consider a shot you hit that does not go into the cross court box as a MISS.
50 hits in a row means that each player hits the ball 25 times. For BH 30 hits in a row is 15 for each player. The serve should NOT count as one of the hits. For warming up, that really should be easy to achieve. It should not be hard. When I was about your level, I had a training partner and we were able to go 20 min straight without missing on either FH or BH. At the moderate pace we were doing it at, it would be about 1800 hits without missing.
Here, like this. Also, note his body position. Knees bent, weight forward, right foot further away from the table than left foot.
Look at your body position and compare.
Also, watch the parts where your shot does not go on the table and see if you can understand why it does not go on the table.
