The "Loadorder.txt" file is good, though I would suggest you use a "Merge Patch" file with that collection.
* If you have more than one mod that makes any change to the same record or set of records in the vanilla game, then you really need to use a "Merge Patch File" with that collection of mods. Please see the 'Third Rule: The Rule of One' and 'Merge Patch File' sections of the wiki "FNV General Mod Use Advice" article. When in doubt, create a "Merge Patch" file anyway.
"Audio" can get tricky because it is essentially a "set-and-forget" operation for the game. The sound file gets passed over to the (independent) audio system and the game waits for the signal back (technically an "interrupt") that it is done playing. I notice you are "overclocking". I've never played with that, so don't really know the pros and cons, but you might want to experiment with slowing it down a bit toward 3GHz to see if that has any impact upon your desync delay. I suspect the audio system has to compensate for the faster CPU speed to prevent the sounds from getting distorted. This is an older game and a 4.5GHz CPU speed was never contemplated when it was designed.