A possible solution to Rengar
Instead of Flat AD + % bonus AD, why not 10 Lethality per stack?
-It fits him more as an Assassin and his theme
-Reduces the power of the current tank build
-Less snowbally
-Good way for players to understand better how strong is the newer lethality over armor penetration system (since it is still relatively new)
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will be great on him
-His numbers will not get out of hand and therefore easier to balance the numbers in his kit.
-He will be regarded as the most Lethal champion, witch fits him very well thematically