The header collector is the limiting factor on getting/staying low. The flange even adds a good 3/8", the lowest point on the silver Duster is that point (4-1/2"). Maybe I will look into an oval collector with a ball/socket type of flange.
The headers are for sure the limiting factor. Although taller tires like you said would help. The shocks were on zero clicks so it was not properly set so the shocks compressed very easily. I set them on aggressive so I'll try that before I go raising it back up. When I bottomed out, it was because the intersection was raised and I was doing about 45 through it. It was when I came off the raised area in the back side is when the car came down quickly and hit the road. It looks like what hit mostly were the aluminum header gaskets at the collectors and a small spot on a driver's side tube. No too much damage. Also a lot of my oil leaking issues are actually where we moved the dipstick and patched. Both of those are weeping through holes that I can't even see in the welds.