Did you even read what I just wrote?

How are your negatives thin? Is there enough shadow detail or not?

It is up to YOU to fine tune your negatives. There will not be a predetermined recipe for that. The internet is full of opinions and methods that work well for others. It does not mean that a developing time that work well for me will work well for you.

Too little contrast? Develop longer.
Too little shadow detail? Expose more.
Repeat until you have results that work for you.