Regarding the slotting of the hubs, I think you're thinking of the DT new aero or Aero speeds? I'm not sure when DT came out with the Aero Comps, but they are only 2.3mm blade width (1.2mm thick versus .9 for the aerolites) which should fit through a normal hub hole.
Indeed the new DT Aero Comp are compatible with standard 2.4mm holes. They will fit any hub with standard flanges.
This new Aero Comp descends from the DT Competition, like the DT Aerolite descends from the DT Revolution. Thus Aero Comp and Competition weight as much, like Aerolite/Revolution. Difference is that the Aero Comp is bladed, its thickness is 1.2mm against 0.9mm for the Aerolite. It is a laterally stiffer spoke.
Nevertheless, because it is bladed, it will be laterally flexier than the DT Competition: the thickness of the spoke matters more than its width for the lateral stiffness, it is the dimensions that directly resists to lateral forces (second moment of area).
@williamf1: if your 6.7 rim the brake pads, I'd advise you first have the spoke tension controlled and second you check if you have any play at the hub.
For sure the 6.7 rims are super stiff. Their weight, their width must come with stiffness, I don't see how the rim by itself would be soft. But I have not performed any lab test on our bench with these rims yet so this is only common sense.
Third, and this is an important thing to know, most stiff wheels come with a higher deflection between the brake pads than soft wheels or extremely stiff wheels. It is also probably the reason why the rim rubs the brake pads.
Finally, the deflection of 6/8mm is absolutely impossible on the road. Basically the lateral load a rim have to deal, near the ground, while standing on the bike does not exceed 100N, which in the worse case make the rim move between the brake pads about 1.00mm. I actually never tested any wheel moving more than 0.95mm at 180° from where the load is applied.
Oh and last but not least, drchull points at the QR issue. You should indeed give another set of QR a try.
I hope this will help.