I have pulled infinitive amount of weapons and I spend more time than most players in D2 and I can tell you first hand that Perk Weighting is widespread.
Example: I can go to Drifter and pull 10 Bygones and most of them will have the same perks on them when I pull them back to back, a lot of which are almost identical roles and since the perk pool for Bygones is so saturated the chances of them being like this is like hitting the lottery.
I know you guys have said that you are looking for a fix for Perk Weighting but please make sure that you look into all weapons because this is happening at everything from Vendors to Tonics to Dungeons.
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Bungie has yet to acknowledge it, but the bug is still alive and kicks in if you focus and engram or have an attunement active. I've done plenty of testing since the "fix" launched. Made posts in which other players tested and found the same results. Basically if you claim an engram rather than focus, it has more true RNG, while if you focus it, then it has the classic rng where only 4 perk combos are likely to occur.