Back in the day Parma did an anti-bump-steer kit which I seem to remember was basically just some stupidly long ball studs (and extended steering tie rods?) to try to bring the tie rods (almost) parallel with the movement of the suspension. It didn't cure it 100% but it did help. However the downside is that they also increased the leverage on the stud so they often got ripped out.
Alternatively, get hold of a re-re Hotshot front hub parts set as they include the original hub and a slightly improved one which has revised geometry on the steering arm. This achieves much the same result as the Parma kit but allows you to retain the original (shorter) ball stud.
Fundamentally the suspension design on the 'Shot is crap. Innovative and funky looking but crap. Too soft on the front and the rear, well, the less said about it the better. When the Hotshot re-re came out there were quite a few Tamiya Hop-Up Hotshot HP suspension kits on ebay to convert it to 4 independent shocks but they've all gone to ground now, though you may find one if you look enough. Probably the best compromise set up is the Boomerang style one, 2 rears and a monoshock front, perhaps you can even use Boomerang re-re bits, there's bound to be someone here or on Tamiyaclub who knows.
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