What baseline idle speed are folks using for tuning their dual Weber Giulia SS / 1600 Veloce engines? Virtually all of the Weber tuning guides / instructions I have found recommend tuning the engine using a 900 RPM idle speed as the baseline but my Giulia SS manual says to set the idle speed to 600-700 RPM which seems like a huge difference. I can quite easily get to a smooth idle using a 900 RPM idle speed but am having a lumpier / erratic (moving around from low 600's to high 600's) idle speed if I target 650 RPM. The ignition timing is dialed into the M mark at 5,000 rpm so I feel quite good that there are no ignition items to address. All input greatly appreciated.