Thanks fellas
i have got an alignment done and its a bit better but still i feel something is a bit missing
the effect is more like a pendulum effect of car rear end not settling down if driven violently lol.
i didnt get a print sheet of what the alignment was done to. so i cant give you any info on that.
its defenitly toed in,  in the rear as the front of the rear wheel is facing inward then the back of the rear wheel. if that makes sense.
 
dont really know what tyre pressure its on atm. but it was recommended i run 38psi or so on the tyres i have (federal SS)

How new are your federals too? I find the 595SS takes a good 5-6k kms to really settle down, otherwise they feel quite floaty. after the 5-6k run in they a decent tyre for the money.

Figured I better throw my two bob's worth in this discussion.
 
If you added the RCA's to the front and rear, without a alignment it will toe out in the rear making it loose handling. The RCA's also alter the throw of the rear of the car so the wheel moves towards the front then rear over the stroke of suspension travel. This too effects to toe settings on the car. This is a issue with the RCA's as you can change RCA's, then the setting of the toe adjustment pivot point(it requires a lot more than you realise to get zero bump steer), but also the pivot point of the trailing arm at the chassis needds to be reset bring everything back into alignment. No one does this as its a serious task to undertake.
The only way to try and get some consistancy within the suspension stroke is to adjust the "caster" of the rear suspension to reduce the front to back movement within your suspension travel operating range.
Examples:
Mine had a issue with the rear of the car moving around which was caused by the rear toe adjustment link was broken(WTAC 2010). Also had a issue with wheel spacers which rendered the car undriveable on its first outing. Once removed, its was OK. It was also nervous under power, so I raised the car by 10mm each session which settled the car as the 'roll centres' were raised to a manageable level. Also had issues with extreme understeer at Winton last year which was caused by too much bump steer up front. A softer setting in the rear of the car with the shocks will help settle the car too.
 
If you not keen on going solo with this, you need to see someone who is very fussy, has self respect, understands MR2's, Lotus and/or Porsche to find the problem and fix it.

Glad to help out where I can.

ball joints have come up in my search a few times now so looks like i will get them checked as well
thanks guys..
 
cheers

Thankyou,
I changed from the original rose joints to a link which is 30+mm lower than standard when I did the mods to the roll centre/ RAC's etc. It was handling OK when I ran at EC last year.Welding up one of the broken tabs may have helped.. Was good at Winton, no issues with movement at the rear, just bump steer issues causing way to much understeer in the slow corners.

Take it to a suspension. Specialist I would recommend