You have a lovely horse. Try lowering your stirrups a hole or two so your legs are more around your horse's barrel. For many of us, it is challenging to stop jumping for our horse, jumping ahead of their motion. One trick that I learned when jumping is to focus on the top rail or part of the jump until you cannot see it anymore through your horses ears. This helps finding the correct distance to the fence which, in turn, should help you to wait for the horse to jump up to you. Best of luck!