Just to summarise what we've already communicated:
1. Height-adjustable air suspension will give you off-road clearance but also allow a good ride height for low drag on made roads.
2. Gaining a good approach angle would normally mean lifting the leading underside edge of the bumper. This is not good for drag or lift. As I think you said, best to have a removable section to change approach angle as required.
3. A full-length bash plate should be good for both low drag and off-road protection. But keep it wide and smooth.
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