It doesn't matter, so long as the tension of the spring does not increase your pedal push effort so much that it becomes annoying. Some of the return springs we used back in the sixties were a real bitc* to get on because they were so stiff. What we would do back then is put the spring in a vise, and place pennies between each coil in the spring, so the spring was long enough to slip on the fork. Then pull each penny out. Way easier than trying to stretch the spring out with a pair of pliers while you lie under the car.
