MossyMax last month made a post about possible weighting on weapons with 12 and 7 perks in columns.
https://x.com/mossy_max/status/1899567430130896930
I can say that from my experience, VoG weapons are definitely affected. I farmed master oracles A LOT, especially last week (you can count red dots on my [url=https://raid.report/pc/4611686018482890420]RR[/url]). Tthe number of Praedyth's Revenge w/ No Distraction was immense, every other had it.
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I did challenge 4 times today so far and ALL of the snipers I've got had No Distractions.