If I read what you are saying correctly then the aperture scale is suspect. The way to determine this is to measure the aperture opening and divide this into the focal length of the lens. That should get you into the ball park of the correct aperture of the lens at the various Fstops.
Originally Posted by JMoore
Unfortunately if you have inadequate shadow detail then there really is nothing that I have found that will give film exposure at the development stage. The film will expose at the proper amount of light. If that isn't present at the time of the exposure then no amount of development compensation is going to impart one bit of light.
As others have related, contrast can be adjusted by development. Exposure can not be adjusted by development.