I am dealing with a total rebuild of my shee once again.....and am waiting on those exact bearings as we speak. I thought about your problem a little more, and come to think taht it might not be those little bushings in the top after all.
At the bottom of the stem there are a few parts. from the top down it goes........Seal, screw down retainer, bearing, seal........the stem goes through it all...and then you put this metal "collar" or "washer" in through the bottom, around the stem and inbetween the seal.....(I hope that made sense) After the collar, you put your washer and nut on the end of the stem and tighten.
Is it possible that you had this apart not to long before you had troubles......I dropped the "collar" that goes in through the bottom once before, I tried to tighten down the nut on the bottom, but it didnt work........I found the "collar" the next day.
Go back and check again......the collar is what holds the stem "down".......The washer and nut tighten against the collar which in turn tightens "up" to the bottom of the bearing -on the inner race. If the collar was gone, it would seem possible to pull the steering stem up some.
Good Luck
Monk
ps...that has to be the most confusing thing i have ever written