Any question answered...

'+' facing forward. The top cap has an offset bolt hole, so you'll want the extra space (indicated by the +) at the front and the reduced space at the back.
If you look at your picture you can see by the shim at the bottom it's tipped back (to increase rise) and has the - at the front.

Edit: taken from the tech docs
" NOTE: Use an offset top cap, with the top cap hole located to match the position of the shim, so that the top cap hole is in line with the steerer tube plug
threads. "
I guess if you sight through the top cap and check the hole lines up with the thread then you should be ok.

That doesn't answer my question. Is it + forward or back?

Have you turned it off-and-on again?