is their a top adjustment too? not familiar with yours but have adjusted many others. most have a top adjustment for bearings. with tires off the ground and side adjustment loose, tighten the bearing until it just starts to drag. next adjust the side until you feel drag, it should feel tighter straight forward and looser at full left or right. noticeable when over tightened but barely when right. now repeat process as either being off effects the other. if bearings or gears are worn out, adjusting wont help but I have fixed dozens of 'adjusted' boxes where the never touched the top.