Thanks guys - I live near Ft Polk and ride 30 miles a day back and forth to work on 171. I hear what you guys are saying, and I did try the open palms fingers pointed forward today on the way in...and it helped. But I can't help but think how much more stable this bike would be if I could lock the headset - don't get me wrong - I like the workout and my upper body is getting stronger - I just want more stability so the cracks on the shoulder and the trucks blowing by don't shake the bike so much. I will continue with the exercises - (I've got the figure 8 down and I can start on a steep hill fine) - I just want more stability at higher speeds.
This is steering inertia you are experiencing, due to weight of the front triangle plus your legs. It takes a while to get used to it, but you will (may take a few month, though). It may never get as effortless as on a fixed bottom bracket, you still have to be 'on edge'... I have about 5k miles on my (DIY, mind) MBB and while I've completed 200 km and 300 km brevets on one, but high-speed descents (especially with trucks blowing by, yup) are still somewhat scary.
Still, I do not regret riding MBB at all - climbing and sprinting feels MUCH better on one. The fact that you do not have to worry about heel strike and can have BB very low (at least in my case) is very good, too - my feet go numb on a high BB.