I mention this because when looking at the backhand banana flip vid I noticed that the grip used for the shot will make it difficult to get much spin or speed. His arm motion is correct but the neutral grip makes the shot more difficult to execute imho. 

The only critique I have is that the cross step foot placement is not being executed correctly, or at least not the same as high level players.

Ball contact should be made after pushing off from the right leg and before the left foot touches the floor. In your sequence the left foot touches the floor first which inhibits the power transmission into the ball by the right leg. 

What I think the sequence should be after the last forehand.

-step out with the right foot/leg first 

-compress the right side to load for the shot

-push off from the right leg lunging towards the ball

-make contact with the ball at the end of the lung/push from the right leg. Usually both feet are off the ground at this point.

-left leg crosses in front of the right leg and contacts the ground

-right leg extends out to the side and contacts the ground 

So right leg out, lean forward and push off, ball contact, left foot, right foot. Basically the payer jumps toward the ball pushing off with the right leg.

Examples-

The crossover footwork section starts at 4:00

How do you normally correct this?

If you observe the highest level players you will see that the NPA is coordinated in such a way as to assist with the upper torso rotation in many ways, both on the FH and the BH. 

Rather than go into a long explanation I will link to a good article on the subject that goes into great detail. I came to all the same conclusions independently. The author has expressed all the of the fundamental concepts well imo. 

https://thoughtsontabletennis.wordpress.com/2014/02/12/proper-use-of-the-non-playing-arm/" rel="nofollow - https://thoughtsontabletennis.wordpress.com/2014/02/12/proper-use-of-the-non-playing-arm/

Some suggestions for variation on this that might help. 

One area that becomes an issue during play is placing the shot away from your opponent when they think they have anticipated where you are going to hit the ball. One way of defeating that is to be able to perceive when the opponent has committed to the direction they think you going to hit to. 

I would suggest a variation on this drill in which the player being drilled hits the ball to the opposite side of where the target is. So if the whoop is moving to the left the the player hits the ball to the right and vise versa. Also remember that movement is best detected with peripheral vision. It works well if the player has central focus on the ball as it is coming into the blade while the peripheral vision detects the motion of the other player.

This is actually a kind of decision training which is worth some investigation.

http://www.humankinetics.com/excerpts/excerpts/explanation-of-the-three-step-decision-training-model" rel="nofollow - http://www.humankinetics.com/excerpts/excerpts/explanation-of-the-three-step-decision-training-model

http://www.pponline.co.uk/encyc/sports-psychology-the-theory-of-the-decision-training-model-in-sport-42359#" rel="nofollow - http://www.pponline.co.uk/encyc/sports-psychology-the-theory-of-the-decision-training-model-in-sport-42359#

LOL I like that.

A suggestion, to make it a little more realistic would be to have the other person holding a paddle and make a move to hit either a FH or a BH. Always try to have cues that are as realistic as possible otherwise your run the risk of the training drill not really transferring to game play.

Its awesome that you are still posting these. As someone wanting to get back into TT, this is invaluable.