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1) should i use the rake when solving?
It's a hard question.
Introducing rake manes the game is no longer zero-sum so it might happen that there are more than one equilibirum. The hope is that rake effect is small enough that it's not a big problem and all sensible equilibria have similar EV. You can do several things:
-solve with rake
-solve withour rake and set rake after solving
-solve without rake and think how to adjust to rake (probably stop playing borderline hands)
I really don't know what is the most practical thing but it seems people mainly prefer the first option. Notice that if you want to solve a lot trees you will need to solve them again if you move to games with different rake structure in the future. My intuition tells me the last option is the most practical for that reason.
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2) if yes, in an 5/10 config (1000nl) is correct to translate the above rake to 5% with 15 chips cap?
Yes, that's the correct way and it's good idea to do that to have more granulity in bet sizes (the solver doesn't do fractions in bet sizes).
Remember that if you are getting rakeback, you need to adjust those numbers to include it.