I have never seen anything on timing the flighting on the swivel systems. They do talk about timeing on the turret system. I can not make sense of directions for timing the augers in the turret system. They say 90 degrees but nothing about leeding or lagging. We chose to install final auger with flighting following vertical auger by approx 1_4 turn. We've been doing the same with swivel systems after years of not paying any attention to timing at all. While your at the job I would consider extending the flighting on hopper auger to withing a 1_4" or so of bushing support. You could taper the square corners of bushing support also to make it easier for grain to flow. We learned most of these tricks from edible bean crop where there is some dirt and soft beans that will plug up that ujoint area so every bit of fine tuning helps. Good luck