"What are the realistic chances of bottoming out on your average circuit?"
Well if you can lower a car so the sills touch the floor then quite high i'ud imagine…
"This is just it, I've not even looked at the driveshaft angle, as since even getting new the springs, the car hasn't been off the axel stands… None of us know what the shaft angles are going to be like…"
Well maybe not none who are reading this, but tbh without doing as we've discussed there's nothing you can do about it anyway ;O