Did a bit of testing today.
I can only go until Torque 2 ingame. Anything above that is a gym session, 10 is impossible. Idk if its the natural 10nM of the T818 or if something is wrong due to DH. I had a DD Pro 8nM before and it was not even close to this. I used Torque 10 with it for a long time.
Since last Firmware the T818 has preset settings, a fixed factory (D), and 3 custom (1, 2, 3). Apparently with the DH it always loads/starts in D. I can go into PC and change, but it gets reset when I plug back into DH.
I created a ticket with TM to see if its possible to change the active preset in the wheel base directly. I don't care about having only 1 preset, but the D one is completely locked which prevents you to enable lots of the wheel features.