Lurker here. I'm just going to chime in before this costs you (and potentially other B2 owners) shipping and time. I noticed a few days after I received my B2's, that they sounded "off-center", the left monitor seemingly softer than the right. Harkening back to my first listening session with them (using the medium silicone tips) I remembered that the imbalance DEFINITELY wasn't there, so I began to experiment. I know my left ear-canal is smaller than my right, and the Comply tip it seems, did not like that. There was nothing wrong with the headphone or the tips, I was simply not squishing the tip correctly, had not properly inserted the tip or had the tip had expanded, and changed in insertion depth. One of the answers to this problem was properly squishing the tip and holding the left monitor in place, and waiting for the left tip to expand in your ear canal, making sure that both monitors are at a comparably equal depth. To make sure that your B2's are genuinely imbalanced, I recommend that you try using the silicon tips (of the correct size of course), and observing whether the imbalance is still present.
I myself plan on getting some Shure Olives, as a possible solution to the insertion depth issue, and as replacements for when the Complys wear out. The Olives are also less expensive, even here in Canada (surprisingly). I will post my results when I get them.
I love my B2's, simply an amazing IEM.
I was kind of looking forward to the ear-hooks though