I would consider stepping up to a good 5 volt or variable volt model. It won't necessarily bring back the flavor but some eliquids do better at higher voltages. You will definitely get warmer and fuller vapor, however, and with some of the higher end models you will definitely get better consistency. Two that I know are top notch are the 5 volt GLV2 and variable wattage Darwin. Both will give you a significantly fuller/warmer vape over your 3.7 volt model. And ofcourse on the Darwin you can adjust the power level for different eliquids. They both handle dual coil cartos quite well, also.