You can try packing the gear diffs with anti-wear grease, the Lazer ball diffs aren't the best in the world and they are hard to keep smooth. Go for the Pureten diffs if you can find them. Personally I preferred the gear diffs as long as there was enough grip to prevent wheel spin.
A slipper is better than the ZX excuse for a centre ball diff that dumps all the power through the front wheels if they start spinning. To convert to a ZX-R slipper you will need LA56 drive hub set, TM12 slipper pads and TM7 spur gear. You should also change the layshaft to LA55 main shaft but the only difference is a flat filed on it for a grub screw and the thrust bearing being replaced by a plastic spacer. I'm sure you could also find alternatives for the spur gear and slipper pads. In the meantime it's worth taking the balls out of the ZX spur gear and clamping it down, pretty rudimentary as a slipper but will give you better traction than the centre diff.
Steering can be ballraced by 5x8mm bearings and 3x6mm flanged bearings on the centre link. Replace the centre link with the ZX-R one, aprt number LA17, or cut a copy yourself. The straight ZX link gives too much ackermann, the bent links give more aggressive steering.
Weak spots are the wishbone mounts and the front gearbox where the shock mount attaches. Replacing the wishbone pivots with alloy ones is the only fix for those, although the outer ones front and rear are more important than the inner ones. The weak front gearbox is caused by the standard shock mounts having a very thin centre section, so in an accident and roll over one shock is bent back which twists the mounting lug off the gearbox. Problem is fixed by using a shock mount that either has the upper points joined together, by doubling up the shock mounts or if you are planning on using custom ones using thicker sheet material and centre section so it can't twist.
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