I like that rig you used. That seems very accurate, at least as accurate as the scale.
Did you try the other parallel roller? I think it’s possible is asymmetric, which could still point to the belts, etc.
Now I’m worried though, because I bought those same bits when Amazon recommended them with my dewalt. I was really hoping to get this thing cutting wood this weekend, but I just finished the stand, and I still have to get it serviced to the stand.
Are your feet pretty strong? I haven’t glued mine yet, but that part seems pretty wiggly to me.