So, the factory specs that are for bias ply tires, and call for positive camber and negative caster. Or, in other words, the exact specs that the QA1 UCA’s are manufactured to correct.
The design of the QA1 UCA’s adds positive caster, and allows for negative camber at the same time. The specs you need to use when you have radial tires. Those UCA’s were specifically designed NOT to run factory specs, which is why that shop can’t get to the factory specs with them.
Use the SKOSH chart, if they won’t then find a different shop.