[eschaider]

You change the pinion angle on four-link suspension by lengthening and shortening the upper and lower links. The shock mount will only allow you more or less suspension travel. The pinion angle is determined by the four-link linkage.

Search four-link suspension set up on YouTube. There are a number of very good videos on four-link design and setup from very reputable shops, including several with software to use on your computer to help you.

Attempting to eyeball the solution is not a good idea, nor is it likely to produce the outcome you want. Take the time to do the job right. You will be glad you did.