There was a washer missing in my package. One of 4 of the tubing screws was very difficult to install. And one other tubing screw I could not get installed.
After installation on my car the rack made too much wind noise to be useable for everyday driving. I tried a hack that seems to have worked well enough - I wrapped the front bar with a bungy cord and moved the plastic deflector lower on the bottom bar. This was after several experiments and now seems to be quiet enough to leave the rack in place for everyday driving. After a week or so I actually don’t hear the wind noise now.
2018 Subaru XV Crosstrek