So, my idea is this :
For all the [b]Exotic weapon from raid[/b], (Thousand Voices, Anarchy, etc...)
Out of season, (when the [b]raid season[/b] is over), each time you open the chest who could containing the weapon and you do not drop it, [u][b]you gain 1% more chance to drop it per character per week[/b][/u], and when you finally get it, the % of drop return to normal.
So it makes [u]3% per week if you have 3 character[/u] and you open each week the chest with them.
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Honestly... It should be the other way around. During the season with the raid, you should be able to guaranteed get it eventually. Since you're doing it when its at its most challenging. With out of season raids going to RNG chance because they're old and easier to farm (Also incentivizes actively participating in the current content)