I don't give a flip what anyone else says, Bach is the hardest thing to play on bass. Nuff said. To get into the style of the piece is very, very difficult. However, it is something that you need to do. Some vibrato will help to accent the notes a bit. Be sure to back off once you hit the initial beat. Dynamics, Dynamics, and you guessed it, Dynamics. Playing with different volumes will help you make the piece sound less like an etude. Spending some quality time with a tuner would help. Not to say the intonation is bad, but it is a solo piece, so you are obviously going to be more exposed than you would be with an orchestra or a piano. Overall, sounds not to shabby. Main thing though is to picture yourself dancing too it, work on your dynamics and bow speed. Once you get those three things down, you should be in excellent shape.
Good Luck,
Peter