Tremec app & O/D Trans with Hotchkis Springs

I think 2.5 degrees down is MAX and should not be equal too or more than Zero (i.e. pointed up). This is probably why the Tremec App is failing you. So trans needs to go up, which you say you can't do any more, so can the motor go down? Like is there a shim under the mounts? I know some people shim the motor up to clear headers, PS, or compensate for sacked mounts. If not your back to getting the trans end up somehow.

But, what is the parallel relation between transmission center line and pinion center line?

Also, are you measuring on a known parallel to the output shaft location on the trans?