Nerfs to Runes Electrocute, Conqueror and Possibly others...

For a while now, I've noticed that more and more players are using these runes, especially for champions that get banned somewhat often, namely Zed , Talon , Yasuo , Katarina , Akali , and others that can do rapid and quick successive damage. People are claiming it's not the characters that are overpowered, maybe for some that's the case, but not for others. As for what's actually causing it, it's more than likely the runes. The runes allow for certain characters to do way too much damage and i feel that nerfs to the runes Conqueror, Electrocute and others like them are absolutely required for future game balance. As for what those nerfs should be I'm not completely certain. However, if I'd suggest one, I'd say that all runes across the board need some kind of reduction of about 5-10% in effectiveness.