Hilti Profis Anchor Steel Standoff Calculation

Can you please provide further clarification on the steel failure (with lever arm) calc done in profis which considers the standoff. When looking at a case with a grout pad, Profis's calc seems much more conservative than AISC DG1. I am only considering the standoff with a grout pad, not the other types. Per the profis design guide, I see that the equations are based off of a European standard ETAG. When using the calculations per AISC DG1, the lever arm is based on the plate thickness and the washer thickness, but does not have to do with the grout thickness. Can there be an option to calculate the bolt capacity using AISC DG1 for this type of scenario rather than the European method from ETAG. It would seem that AISC DG1 governs over any European standard for projects in the USA governed by IBC or ASCE 7.

Thank You!