i was struggling with the same issues as you and found i'm at a point now where i need and adjustable rear beam of zoo, but vast improvements i found were from the quaife diff, remove rear arb, axle tightening kit, increase profile of rear tyres went from 40 to 45 handles dam good and corners like a cunt with the lead down, i knock about with tib, i got a saph with 373 @ back wheels dont know fly figure