Front rack symmetry - spacers and handling
No, use the minimal amount of spacer possible. Having to space them out at all is a necessary evil and introduces risk of the bolts loosening or getting bent/broken. That risk far outweighs any upside of making them symmetrical, because spaced out rack bolts having issues like that is a real thing that happens. You probably won't be able to notice any handling differences from this much spacer regardless, but if you did you could negate it by packing slightly less weight in the more leveraged side.