Moving springs back 1 "

As long as the hanger bolts are long enough, make a spacer that looks like and "E" that you can loosen bolts, move hanger rearward and slide the E shaped spacer in. Mark a channel for the upper and lower bolts top pass through and cut with a grinder/cutoff wheel.

It's easier than drilling 4 holes and doesn't require fully removing the hanger from your chassis.