Arm action for RTH smash is ok.
Drop shot action is still very wrong. You pan handle and hit low instead of playing it like a normal stroke.
Forehand shots are taken far too low. Your elbow is barely parallel with your shoulder when you're hitting a lot of them.
Need to develop your forehand kickthrough so you get full turning motion. If you were a clock, you'd want your right foot to come through to 11/12/1 o'clock, but right now it's stopping at almost 3. There are times on both forehand and backhand where you're almost falling backwards, but still trying to play attacking shots. You're a fairly broad guy and you look like you have strength, and I think that right now that's compensating technique somewhat.
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Take a look here, when you land, your feet and body are trying to turn more. This means you're prepared to pick up the cross reply, but as you played a straight smash, and your partner is in the middle, it feels like you're redirecting your energy in the wrong direction. This is energy you could be transferring into the shuttle.
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In another instance, this is just after a smash. You're so off-balance here, that you have to take another step backwards to catch yourself. ()
Your dropshot action needs a lot of work. The type of shot you're playing is sometimes used in singles when played deep into the forehand corner, but this should not be your default style of drop shot. This rally here is good at showing different types of drop shots, including the one you default to which is used in the late forehand corner.
Lin Dan's final dropshot especially, is taken high with a quick racket movement. He doesn't default to pan handling, instead he cuts across the shuttle. You can see his arm is reaching quite high.
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I think the three big things for me are:
1) Work on your balance. Take a look back over some footwork tutorials, and focus on incorporating elements of them into your movement that will help you maintain that balance.
2) Work on bringing your elbow upwards. We can't always take the shot as high as we'd like, but there are times where you have opportunity to hit and instead let the shuttle drop. This is moreso true for your forehand side. You reach up higher for your RTH shots.
3) Fix that drop shot. What you're doing is extremely limiting.
Thank you for the break down and analysis here. I completely agree with your three points.
I think me not being able to practice before the games started hurt me a lot.