How can I adjust wheelbase?

You could add a thick washer behind the strut rod bushing, that would move the LCA back to help the tire clear the fender, then readjust the alignment

1.5" thick? Yeah keep dreamin.

To the OP, something is WRONG somewhere and you need to find it. Whether it's been hit and has frame damage, different length strut rods as mentioned, something assembled incorrectly......SOMETHING SOMEWHERE is amiss. Shouldn't be that hard to find as big a difference as that is.