Moving springs back 1 "

There is a lot of engineering that plays into why the rear axle is shifted. Some of it is based on simply the crown in the asphault.
With enough research into the history of round track racing ( nascar ) you'll learn why it began with left turns.
If you plan to run a straight line on 2 wheels, on a flat surface, of course you have to alter a street cars engineeed thrust angle
There is a whole lot more cause and effects involved from how a limited slip differential functions to why the left front brake wears faster than all the others.
Bottom line, If I ever do make a change it will be an equal change on both sides.
Mine is a street only car so I dont need to second guess those who are/were much smarter than me.