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I don't know the specs, but make sure you've had a good alignment too. Some of the Aussie racers might be able to counsel you on tweaked alignment.
The steering box may be a gonner, but make sure its been adjusted properly before you toss it.
I had 195/50/15s on a 4.5" narrowed beam w/ castor shims, dropped spindles, and a rebuilt steering box. It was very stable at high speed. I didn't even have sway bars.
Also check out how much of a rake you have(front height VS rear height). If it is quite extreme, you may have to add 2 shims. My suggestion would be to lower the back to keep your CG(center of gravity) low. Not too low on either though, because road obstacles can be a real hazard and hard on your frame head (I've cleared off a few of those zirconium bumps on the freeway before!)
Jason
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