First Evelynn results are in..... and it's laughable.
Today we're seeing the first results on stats pages of Evelynn after the rework.
She dropped to slightly over 48%.
http://champion.gg/champion/Evelynn/Jungle? https://lolalytics.com/ranked/worldwide/current/platinum/plus/champion/Evelynn/
It's amazing how much a champ falls when she loses enough damage that her Tier 2 clear is slowed, many of her early "on the cusp" kills lose ~50-100 damage and no longer become kills, and primary source of post 12 minute gold is taken away 
Bottom line: Evelynn's kit items are limited, and every time you adjust her, the result is going to be predictable. She will either succeed or fail hard, and she farms weaker due to W creating lag times on monsters in the jungle.
My Advice? Make Charm instant vs Monsters, OR; add more Monster damage to her Q. Or.... adjust Electrocute so that it has counterplay (It's high elo's primary rune because of the fast, punishing pace).