I like a little more sidecar wheel lead than most folks do as it reduces the tendancy to nose dive in left turns.
Your bike may just have a shimmy-modifying the trail could be more effective than moving the sidecar wheel or reducing the track.
Before I did anything I would try putting new tires on front and back and play with the tire pressures(within spec). Also check the mounts for tightness. Wobbles can be caused or accentuated by differences in tire tread/wear front and back, bad wheel bearings and loose or broken sidecar mounts. Doublecheck the easy and inexpensive stuff first.
And I am sure you have secured your temporary ballast in such a way it wont shift in the event of an accident or hard braking?
I agree with Lonnie about the stearing head bearings (it makes a huge difference), and with the Red Menace about having enough sidecar wheel lead to prevent tipovers (I like to go as fast turning right as I do turning left), but I personally don't like ballast (I've only got about 45 hp) and prefer a narrower track to improve performance (tracking and left hand turns).
Have a look at the "German Sidecar Manual" available somewhere on this website and it will help you understand the hows and whys of lead and track. But in the end it really boils down to what kind of rig you want to ride, and how you want to ride it. Mine is a 1977 R75/7 with a Ural sidecar that I like to fly the chair on at high speeds, low speeds, and all speeds in between. Build your rig to match your needs and you're likly to be most satisfied.
Jim
