Too much speed ruins everything. Make sure you perform it smoothly and also, make sure you go through the explanation correctly.
Update: it would be reasonable to upload the performance on YouTube. We, of course, are magicians, but not real mind-readers.
If you don't already do, try to perform it with your hands a little bit higher, lets say about in front of your face.
I'm getting into it in these days like you and I noticed that's true: the most important thing in this flourish is the smoothness... however I can't do it fast.