The outer races are pressed to the hub and the distance between the two ends is fixed.
The inner races should extend beyond the hub by a fraction of a mm, even with zero end-float.
If the aluminium is scraping on the wishbone there is something seriously amis.
Only way to find out is to remove the hub and inspect the bearings. Best get some new ones.
A good idea is also to change the felt seals with double lip seals.
If you decide to use a jack to open the wishbone clearance be extremely careful. It has to be tight and if you over do it you will not be able to bend it back.
I would not recommend the use of washers between the hub and the wishbone. They are soft and they will deform. It might also affect the geometry if you put only in one side.