I removed the lowering blocks on mine.
That reduced grounding a lot.
The spare wheel can not cause that much difference compared to co-pilot and a big suitcase on the rack which is standard on holiday trips. My car can handle the weight in the rear.
Hannes, which leaf springs do you use. And does the height without the lowering blocks still match the front hight or had you to level up the front as well? In the „Have you driven today...“ thread your car in the recent photo looks quite balanced.