"Working" with bassists... heh... oh, don't get me started on bass players....
But yeah, it's normal to stay away from the lower notes on the keyboard, as they will generally muddy the lower end of the sound, which has to be clearly defined by the bass and the kick drum.
There are many exceptions off course and it also depends on the music, the arrangements and what type of bassist you are playing with.
The best way to use your left hand would typically be adding more different sounds to the mix, rather than adding many octaves of the same sound.
I.E. you can use two different keyboards OR just make a split on your one keyboard, for example with an organ for the right hand and an electric piano for the left hand (or whatever the song calls for), and transpose both sounds so you can play them both in the mid- to upper octaves.