I've never been good at jumps like these because I always manage to hit the wrong bass note when I go back. Should I focus on the left hand more than the right, so even if I do mess up the melody, I can continue with the rhythm and get back on track?
Another Idea , though it usually comes later on in your development is to learn not to look at all at your left hand. In fact close your eyes and begin to feel the jumps without your eyes getting in the way.
I have no problems with the jumps in Chopins's Op. 9 No. 2 Nocturne in Eb. Probably because I studied Joplins's Maple Leaf Rag which I personally just love which has huge jumps in the left hand. I found adding an additional octave (or even 2 octaves) to the jump to be the one of the most effective techniques I have ever found. This technique is called over practicing. To read more about this check out Piano practice for Dummies which is actually full of all kinds of useful information that I didn't find elsewhere. I've read many books Chang, Sandor, Cooke and lots of posts here as well.Over practicing in a nutshell is making whatever your trying to do even harder. So if you jump twice as far and turn the metronome to even 1 click faster than half your current tempo your jumping technique (speed anyway) has improved.Finally, practice take offs and landings. After all we are talking jumps here. What does a track and field long jumper do but take off and landings. Take offs should be with a kick (push off in the direction your moving your hand). In other words don't lift your hand straight up as your coming off the keys. Practice pressing the keys not straight down but at an angle. Your eyes should now be looking to where your going to.Move your hand as fast as you can to the new position, feel the keys (you should have time) and then the landing should be straight down. This feeling of the keys and the waiting should eliminate any wrong notes in the jump.That's all I know about jumps.