The original poster has QA1 UCA’s. Those give about 1/4” or so more clearance.
Also, they may rub at full droop. So need to check at ride height.
Then you can put 1/16”, 1/8”, 3/16” spacer to fine tune the clearance (front and rear)
But you are right full cast rim can reduce clearance. Especially old rims. The welded center to spun aluminum hoops have more room.