I don't understand this type of post. OP do you realize this game is singleplayer? It's not supposed to be balanced. Balancing it would make it boring. And about the scaling. Just mod the game yourself. Larian has provided us with an incredibly easy to mod engine. Play with these values in Data.txt:

key "FirstVitalityLeapLevel","9"
key "FirstVitalityLeapGrowth","1.25"
key "SecondVitalityLeapLevel","13"
key "SecondVitalityLeapGrowth","1.5"
key "ThirdVitalityLeapLevel","16"
key "ThirdVitalityLeapGrowth","1.25"
key "FourthVitalityLeapLevel","18"
key "FourthVitalityLeapGrowth","1.5"

And you will eventually get a more steady and normalized leveling progression. It's that easy. And to quote sven: "Mods fix what we fucked up." Stop whining daily, and fix this stuff yourself.