Eyeballing my bearings, they are fully on and normal to the rails. I use standard conduit from Home Depot. I did need to use a wide screwdriver to slightly wedge open the corner blocks to get the rails in but it was not difficult. Can you include some photos of the bearing problems? I don’t understand “Nuts are barely on the roller bearings.” Are your bolts too short?
What printer and nozzle are you using? Perhaps you need to calibrate your extruder.