I rebuilt my brother in laws 06 stumpy suspension and it was night and day better. Even when the bearings felt ok ish.
The lower pivot on those uses full complement bearings which means they are fully packed with balls, they don’t have a cage that spaces the balls apart which is great for low motion movement(it only ever strikes a small arc) but they are pretty sensitive to dirt and grime.
The pivot bolts are all Ali as well and hate being “dry”.
They are pretty easy to strip down so go for it and grease that baby up and see if it helps.