I think it's a matter of both the above comments. One wants "the look" of the wheels being centered in the opening, but you must have measurements to be certain that the frame is kept square and the same length on each side.

Take plenty of measures and right them down. Then after you move the front clip, re-measure in the same locations and make sure the frame is the same side to side measurement ( equal distances) from before and after. Also make certain you don't push the front clip to one side more than the other.