sounds like your diffs are properly shimmed. I use, as well as others on this messege board diff lube. Go 5000 frt/7000ctr/ and 1000rear. If your going to change out the clutch shoes, get some mugen black clutch shoes. They seem to last alot longer than other clutch shoe in the market. You can also try GS or kyosho. Remember, all 3 shoe clutches are compatable with the swift.
Since you have the car apart, you might as well check the CVJ center drive shafts. Remove one-set screw and tightned down the other set screw and loc-tite it down.
If your gonna change the oil in your shocks, use 60 wght in front and 50 wght in the rear.