So many easy ways to tone down adcs.
But your Game design team has too much of a favoritism for braindead champs. Which is pretty normal considering they are low tier players who don't wanna put time into the game to master champions.
You simply up his detection radious and drasticly reduce the piercing dmg his ult does so he cant kill more than one person per ult cast. OR BETTER YET MAKE HIM FOCUSED AROUND HIS POSION.
Simply remove the dmg from buster shot cause she doesnt need a 200-500 magic damage nuke that knock backs and can give her an extra undodgeable autoattack cause any good Trist player can poop another auto when she casts it for a GarenTeed extra hit. AND make her W ONLY RESET on K-I-L-L-S. She is a 600+ range Kha'zix i litterally play her like a Kha'zix and it works HELL EVEN QTPIE has the same gamestyle i got on tristana and it works fine for him in HIGH elo meanwhile im in garbage D4.
Remover her from the game DUH. Jokes aside make her W deal magic dmg and when she ults she gets to do true dmg instead of magic. ALSO give her camouflage cause her only counterplay is beeing oneshot or knocked up ( considering she can still auto snared) but if she has stealth every 2.5/3 seconds you cannot touch her.
There was AN AWSOME idea about Lucian posted about his guns doing different dmg considering one of the guns is his wife's this will make him all around more relevant and not only strong when he can abuse lethality and cleaver with his passive procs.
You can't fix this thing without a rework sorry.
NO adc should have an ability that makes them immune to everything aside existing dots on them regardless of skillcap make it so she does some edgy spin and throws out the feathers instead of jumpin in the air beeing untargetable and then pressing E instantly for an easy 500+ dmg burst.