Make sure you follow the steps in this link below for using with EpsonScan:
It’s important that the settings you use are the ones listed in the link above, otherwise, you will not have a neutral tiff to start with. Also, when using Negative Lab Pro with a tiff file, it is generally recommended to leave the white-balance AS-IS before conversion (in other words, DON’T white balance off the film border in Lightroom on a TIFF).