Thanks to Tony Bones for his referral to Chris Franklin at Centre of Gravity. Another man totally into geo and all the technical talk. If him and Tony met up, the conversation would be in another world....
Pics!!!
Chris was adamant that ride heights should be measured properly before the install

The pimp ride minus wheels!

Tein CS vs OEM setup

These are Tein Version 2

Rear chassis brace and rear anti roll bar installed (it's hollow, but bigger, OEM was solid and smaller)

Front anti roll bar installed (it's solid, OEM was hollow)

The man himself

No, it ain't a TRD trained mechanic, it's ME..Chris let me have a go at some of the hands on work...

Chris getting the scales ready for corner weighting

Apparently, you must simulate normal weight of car, so in went the weights on driver's seat to simulate ME!


This was the final result of the corner weighting, 50.2% of weight spread from across opposite corners of the car

Finally, the geo got set properly

A few tips for anyone else...
The car is now lowered to a point where I have too much negative camber, and no camber correction kits exist for the GS
The corner weighting really DOES make a difference, I drove the car before it was done, and it was crap to drive. The corner weighting and geometry really made it brilliant!