Early A: Have plans/diagram/photos of Rear Shock Extension?

Personally I would wait until you get the car on the ground with a full tank of fuel and let it sit for a couple of weeks then decide if you need any shock extensions. Depending on where your front jack stands are sitting it might not be allowing enough weight transfer on the back of the car.

I do like how you marked the shock with tape so you can see what is going on with how the shock sits.