Well for one the headphones that you bought don't really scale much at all and lastly you indicated that you want more bass but would like to maintain clarity...That's not something a DAC is going to automatically grant you. The V-Moda house sound is already super bassy in comparison to what many people consider neutral and therefore you'd probably just be better off EQing in the amount of bass you want and living with whatever imbalance it causes. In my opinion if you find the sound signature lacking it would be better to find a pair of wired headphones with your ideal sound signature rather than buy a DAC, considering you probably won't notice much of a difference adding a portable DAC. I heard fitting them
XL pads helps though if you just want to find a cheap way to improve the sound signature slightly.