I think they reverted Kadala's initial buff. I have been having the same problem. Even doing RiFs, I have seen a sharp drop in legendaries from Kadala. Going for my T&T, with 500 shards, I would see around like 3-4 legendaries (mostly St. Andrew's garbage). Now, I am lucky if I get a single one.
Rift it Forward. It is a community where runners advertise their rifts after the guardian spawns. People join and someone who joined (lowest paragon, last in the game, whatever the runner dictates) opens a new rift after they kill the guardian and everyone leaves. The runners get free rift opens and everyone else gets potentially free (about 1/3 of the time) shards and chances at loot.