The right kind of practice is going to help the most. One thing you may or may not have tried is practicing with a metronome (if you don't own a metronome, googling "metronome" will pull up google's metronome). Pick a target for accuracy and slow the metronome down until hitting one key per beat with your target accuracy works. Then gradually speed up the metronome, keeping your accuracy at the desired level.

Steve Yegge recommends deleting whole words and retyping instead of using backspace, this might help you. On a Mac Option-Delete will do this.