I didn't adjust the volume at all as it seems about quiet enough to fit in with the other tracks, but if you believe otherwise, let me know. And if possible, perhaps the amount you think it should be adjusted by. For reference, I use Audacity to make these heist track mods, if that's useful information.
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There is also a Stealth-Only Heist version of this track, but implementation is wonky unless I can figure out a way to get the game to ignore most of the stealth events besides the initial one and the Point of No Return timer. If you have issues getting the stealth-only track to play, you may need the Music Volume Mixer mod which fixes some bugs related to custom stealth-only tracks, and will need to hover over the track in preplanning to activate the music preview right before starting the heist in order to load it properly. This is less a problem with my mod and more just the stealth-only music module itself.
All rights belong to the original composer, Simon Viklund, and the rights to the PAYDAY franchise go to Overkill and Starbreeze.