Chris,
I read you comments on carburettor set up with interest.
I have also been having problems with the idle phase and have not yet got to the bottom of it, the principle problem being with stalling from standing or slow running. This is with a pair of 40DCZ's on a 2.5L engine (S6).
I assume that 36DCZ carburettors are not easy to obtain, and then would need some adjustment to fit and also tune.
Would it really make enough difference to the usability of the car to make the whole exercise worthwhile, given the probable expense involved?
In my case, I am not likely to be doing any racing and I have not been able to make a direct comparison with another similar car.
Charles