No unfortunately my transmission is currently leaking it's fluid everywhere so waiting for a helicoil kit to arrive before I can fire it up again but I don't think the sway bar will make any difference. Will update with what difference the spring makes and take it from there.
The spring on my car is almost straight. Nothing like the curve on Dazaa's. With 8" bolts the ride height is 27 1/2 inches to the wheel arch. 225/70 tyres. Bottom of the bolts is level with wheel rim so would just about be okay with a flat tyre.
You never see two C3's with the same ride height.... Over the years they've all had different springs and tyres/wheels fitted, or sagged differently. Not sure if anyone actually knows what the correct height is supposed to be anymore!!
As Barry says it's vital to roll the car back and forward at least 6ft every time you put it back on the ground otherwise the car will sit-up a lot.