I performed the taper roller bearing change. I can now take my hands off the bars and have zero shake/shimmy. However, it seems that i now have a low 20mph weave. I did read that a weave is an indication of over tight steering stem bearings. How is proper bearing compression determined? Anything better than guess and test?
If you have them too tight you'll know, the steering will feel 'stiff' and the bike won't flop over into a turn like it should.
What I found with mine is trial and error worked better than trying to use any published values in a manual. If you elevate the front wheel off the ground, grab a lower fork tube in each hand, and push fore/aft rapidly, you shouldn't feel any clicking, if you do its too loose. Keep tightening little by little until the click goes away, and you'll be set, it shouldn't be too tight.
If its way too tight you'll notice the steering symptom I mentioned, and you'll also notice that if you try to turn the elevated front wheel from lock to lock there's a noticeable resistance to movement.
However, depending on how well you got the new races seated in the steering stem, it may loosen up by riding it for a few hundred miles or so as the races get pounded further into the stem by road impacts. So, if its just a little tight you may want to ride it a while and see if it loosens up on its own. If its a lot tight then you probably want to re-adjust it.