Remove Kleptomancy
This isn't a suggestion or a question anymore. You've nerfed champions who rely on this stupid rune to the point where they have to use it, and it doesn't fix the fucking issue of the damn thing.
Let me give you an example:
I just had a game where I laned against a Gangplank. We traded a bunch (as will happen when a guy keeps shooting a pistol at you) and we were both forced to back right at level 4. He had gotten a total of 10 gold from Klepto and 3 items. He returned to lane with a full sheen and he had gotten a total of 120 gold from klepto. On top of farming minions he was also an entire minion wave ahead.
How do you play around that? How is that fair? These are rhetorical questions of course because the answers are "you can't" and "it isn't", even in the opposite direction.
I had another game where the Gangplank scored a total of 3 items during lane phase total and only got 100 gold by 15 minutes because his RNG was so bad. He understandably ended up fairing much worse against me.
This doesn't make the game fun. It doesn't even make it fair. When this champion's getting nerfed because he's a nightmare to deal with on the off chance that the game gives him the favor with one rune, that's called piss poor balancing. This rune is unarguably a mistake - I legitimately can't fathom why you would put an RNG based rune in the game when a universally accepted issue with the game is the crit mechanics and that they're RNG based.
That's like knowing fire would burn your hand so you stick your dick in it instead.