I have tried more than 2 and found that with all of the other stuff I also have going on 2 is the most I can handle.
Recently I started something and it is working out ok for me. I will play say 01/02 on two tables and then I got to figure i was doing pretty well at this so I changed to one 01/02 and one 02/05 I did fairly well at this and jumped to two 02/05. Didn't like the way i was doing here so I dropped back down to one of each. Can move very comfortably between these configurations depending on my play and still be well within proper BR management.