These must be some crazy post holes for you to hit at stock height or you are taking them way too fast. You maybe have broken springs and really bad shocks if you scrape your lseverytime you hit pot holes. If these are just huge pot holes that you cant avoid, maybe get a truck or a lifted truck.
I'm lowered plus I have a pipe sticking out an inch or so below my bumper, an inch doesn't not seem like a lot but it is when you add dropping your ls and have minimal clearance.. I don't really scrape unless its a ridiculously steep driveway or just some jerk taking up both lanes trying at the entrance at which point I cant hog the whole driveway/entrance myself to take it at an angle to avoid scraping.
If you're issue is that serious, take a video of you driving over all the pot holes and things you scrape on. I'm sure most of us would like to see this in action to further help you.