The first question I'd ask is: Are you looking at the wave? 🙂
If you're not front-on or your leading arm is in the way and stopping your twist, it's much harder to see where the water is drawing up and then lift the coffee cup to the lip.
Do you have any videos?
Replied on Having a lot of trouble with my backs...
27 May 22:04
Steven Segal As Michiel suggested, use the "photo" button then select your video.
Alternatively, create a new post, then reply to yourself and use the + button in the circle to add the clip.