Thanks for fixing the instructions. There is one other place on the page where it seems to still say “The GT2 belts … should be installed at between 3-10 lbs of tension (they can handle much more)”.
The problem I thought I was having was that diagonal movement seemed a bit jerky (remember that I had only about 2lbs on one or two of the belts). And since I had less tension than the official instructions page, I assumed that was related.
It seems smoother now at 6lbs. Do you think I should remove the zip ties and go back down to, say, 4lbs? I am really new to this.