Definitely rushing the toss a lot I think, and not coiling enough. if your rushing your toss, you dont have enough time to coil. Maybe even toss it a bit higher and into the court and go after it. Your tall, so you all your height and get the contact point higher.
In saying that I like how simple it looks. Not too much going on, which means not too much to fix up! Seems like your sort of chanelling Roddick/Tomic now as opposed to Federer previously.