With all of your pivots, you needed to finish the turn completely, getting your horse straight, then going into your next maneuver.
First set-up - you should keep one hind foot planted, and move the other one to set your horse up. You backed your horse into it. You already mentioned the front feet. Then as you are moving around, you need to look at your horse to ensure that he hasn't moved. I like to step to the other side, glance at the feet, then to the horse's eye, then back to the judge. It only takes a second, but shows that you know what your horse is doing.
Then when you are walking, trotting, and backing, make sure you take full strides for yourself. Your movements here need to be with more purpose, like you are sure of yourself and that you know your horse will follow right beside you no matter what speed you go.
You have a great basis to work from, these are picky things that I noticed, but should help you move up some. Best of luck!!