I believe you may have set your expectations of the M100’s bass response a little high – no disrespect intended at all and I do not believe you are doing anything “wrong”. Reading the reviews here and on other sites, the V-Modas are often referred to as “bass head” cans but most said reviewers are comparing them to “neutral” sound signatures. I think of the M100 as having a “fun” sound with an elevated bass signature – not “bass head” at all (I am sure there are those who vehemently disagree). Also, listening to an IEM compared to an over ear design is a totally different experience. Case in point: my Velodyne vPulse IEMs can freakin’ rattle my skull whereas the M100s on the same song sound great but do not have that immediacy and, frankly, I feel any more bass would be overwhelming. The same is true when going from a closed back design to an open back. My Fidelio X1s rock, with great bass, but do not have the intensity of the M100s. The next step out would be a car system, then a home stereo, etc. On a couple “bass shy” (actually, quite neutral) headphones that I have, I sometimes use a Digizoid ZO2 digital subwoofer (around $100) that hooks up between source and headphones and they become absolute monsters. I tried the ZO2 on the M100s and the bass was way too bloated and overpowering – you might like it! If you still are not satisfied with the M100s, by all means return them and look elsewhere. They certainly are not for everyone. There are quite a few threads on here regarding bass head cans – I hear the Sony Xtra Bass series are pretty good in that regard. Good luck in your quest!