one thing to be aware of when playing full chords with your left hand is the how low on the piano you are. For example, playing a CEG really low would sound kind of muddy, not phat. However if you play the CEG on you right hand and play something like CGB on your left, you have spaced it out a bit at the bottom and so the chord sounds more full. For the purpose of numbers, that would be 1, 5, and 7 in the left hand. Playing that chord by the way is a C major 7th chord. Again if you do play the CEG in you left hand, you have to move both of your hands up an octave, or try changing the inversion to GCE, again not to low on the piano though. See if that helps you out a little bit.