Oh man... my LH is so 'creative' though..... I'm having a hard time getting it to behave so that I can get my boogie and stride on!In those styles, the LH has to be solid like a rock! A very.....movable rock.....
Start out by playing pianissimo slowly in both hands, and when you think you're pretty fluent start gradually playing harder with the right hand.Try working on waltzes, they always make you more sensitive to that kind of stuff.
Practice improvising with your left hand alone! Develop your LH until it is your main creative voice at the piano!
I always liked practicing light arpeggio in the left hand as an exercise toward gaining a light touch in the bass. Then add a melody, even if it's just a made up thing of your own to play against that. Keep the light bass going and increase and decrease the melody in the right hand , again as an exercise. Don't be afraid to let loose with the volume in that right hand now and then, let it roar. You will start to gain control in both hands in due time. Let it roar in both hands as well as you gain confidence, it's the only way you will learn the range of your instrument really.