Why not make a new feature where you pick a gem you want to level. Instead of chance at a lvl, it gains exp just like paragon. Maybe even have a slider where you can dump every point of exp into it, half, or 10%. Maybe add breakpoints into the game where once you do something, or do it a certain amount of times, a particular gem gains 10 levels? Dunno.
There's addititive and multiplicative. You start with 50, then 50% of that would be 75, etc etc which is still pretty damn high. Like it said in the beginning this isn't accurate info so it most likely caps out at 50% with all stacks.
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Why not make a new feature where you pick a gem you want to level. Instead of chance at a lvl, it gains exp just like paragon. Maybe even have a slider where you can dump every point of exp into it, half, or 10%. Maybe add breakpoints into the game where once you do something, or do it a certain amount of times, a particular gem gains 10 levels? Dunno.