One option may be to fit a modified sump to give additional ground clearance, but you would need to ensure there is enough capacity to hold the required amount of oil.

Stiffer shock absorbers may help a little but you would need to match this to stiffer springs, as these will have a greater impact on the amount of suspension travel. We would suggest going back to ESM and explaining your requirements as they will likely be able to offer advice and the right components to counter the lack of ground clearance.