Just to be sure I understand, you are saying that the 5 degree angle in the front is due to a slight difference between the upper and lower bar on the front and the 3 degree setting is the corresponding difference in the rear? Simplistically this might mean two more threads on the bottom bar on the front and maybe only one extra thread on the bottom of the rear bars?
It's great to get advice from experienced folks like you.

Don Shillady
Retired Scientist/teen rodder