Why not adjust the kerb with some wooden blocks or if not on the main road cement?
If its shared and on a main road I doubt you can modify it but nothing stopping you placing some wood or something to shallow the angle/amount the front wheels drop as you come off the kerb you might have to be prepared for them to disappear every now and then if a street sweeper comes along. I am assuming we are talking about the road surface being a big drop from the kerb.
This is the main thing stopping me from lowering my GTI. My splitter slighty scrapes the ground when entering my drive. If I lower the car then it will probably break off easily.And the second reason is the speed bumps on my road. So lowering mine is out of the question really
Just some thoughts:- putting some weight into the boot will help significiently (!!!)- the rear will never be a problem;descending rear will raise front- if necessary replace the ED30 splitter with a standard GTI oneIt would be helpful making some pictures and measuring the actual space.But keep in mind that if you stop with hand brake the height will change. So possibly better get help by someone else.
I ground my Ed30 splitter quite regularly unfortunately and I'm only on 20mm AP springs