Nice read Redd.. we got pretty much the same setup with a few differences which might interst you.
As mentioned above having the GTA uprights will give you a bit more negative camber with a higher ride hight. Which in turn (IMO) makes the car handle better as a fast road car since you dont have to go extremely low and loose all comfort/Damper control.
I think a realtive high ride hight helps a lot with keeping the rear in place or should i say controllable. Combined with a stiffer ARB and relative low rear tire pressure /sticky tires i found a very nice compromise.
After getting to know the car on the Ring trip, some of the monst enjoyable sections was the relative quick left-right or right-left combinations. not really something you would expect to be a favorite discipline of a 156 V6, so i figure I got it fairly well sorted.
I found the latest chart from the setting i had done before going to the ring.
-1 degree 48 negative camber at the front (higher then i remembered)
-1 degree 35 negative camber at the rear
2.8 mm toe out at the front - (seperat toe 1.4mm) And it works fantastic!! the turn in was improved, and i mean it was really improved over the old setting..it tuns in very fast now, and manages to keep the line really well aided by the overall setup.
I don't know how bad inner front tire wear this setting will result in yet, but after 3.000 km there is nothing alarming to report. If i was to fit Poly bushes, i reckon it would feel very very sharp on turn in.
-0.5 degree Toe in at the rear (seperate toe -0,2 & -0,3mm)
Caster front + 3 degree 40
damn... al this talk makes me want to go back to the Ring soooo bad..
like everyone has said, not much is adjustable on 156. your camber will be a natural result of ur ride height/springs. the lower u go the more -ve camber ur gonna wind up with.
ive experimented with toe a great deal and this is what i've found works for me - 1mm toe-out front, and 0mm toe rear.
1mm toe out front is quite aggressive, so watch ur tire wear. but the front end turn-in response is fantastic! anything more than 1mm out and i start having to fight squirminess under hard braking.
combined with the 0mm toe in the rear, the balance is quite nice. it favours a slightly looser tail so its very possible to get into a nice, controllable tail slide on tight corners. watch your lines on high-speed sweepers tho. but it's not at all snappy. if u want to be safe, u can go with a 0.25mm toe-in at the rear.