The first thing I’d do is replace the skewer with a closed cam design if you can’ haven’t already. It can be hard to get the skewer tight enough to work well with a disc otherwise.

Also check the alignment of caliper carefully. If the disc tabs aren’t machined perfectly perpendicular to the disc you may be able to get it to not rub in the stand, but not have enough clearance in real world conditions. Having the mount faced at a shop with appropriate tooling isn’t a bad idea.