Theory Question - building ranges

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Theory Question - building ranges

Hey guys,

I have a couple of questions about theory and how it should be put into practice.

1- Let`s say a villain opens MP with an 18% range and he folds to 3bets from MP oop 75%. It`s 200nl and he opens to 6. If I 3bet to 18, he has to fold 18 / [18+6+2+1] = 66% of the time for me to auto profit.
So if villain folds 75%, i`m auto profiting 3betting any two in a vacuum. But if I 3bet everytime he opens he`s gonna realise it and adjust.
How do I define the correct strategy to exploit him here ? How should I build my range ? Should I 3bet him with a 15% range ? 18% ? 3% value hands, 12% bluffs ? How do you come up with the best strategy here ? Sometimes I feel like I`m 3betting way too much, and they do start 4betting me more frequently and stuff. But sometimes I think I`m not exploiting them enough. So I want to know which exact frequency I should use so that they don`t auto adjust, but also that exploits them enough for folding so much to 3bets.

Is there a theoretical correct answer for this, or is it more intuitive since it`s exploitative play ?


2- If someone opens 2x on the button, they need the blinds to fold 58% of the time to auto profit with their steal. So my minimum defend percentage should be 42% (putting together my BB defend% and SB defend%) , is this correct ?
If I defend less then 42%, they are exploiting me, I am exploitable. In theory, their openning range shouldn`t metter, I should defend 42% to not be exploitable, right ?
But what if villain is opening 20% on the button ? Should I still defend my wideish range ? What if he opens 15% ?

What I can`t really understand is when I should worry about not being exploitable, and when to worry about exploiting villain. I have a really hard time working with exploitative play and theory optimal.

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