I drove around dirt roads a little yesterday, and the only time it hit was when I tried to hit the wheel into a pot hole. Even that just slightly bent the metal back and I could bend it back in a second. I think I'll keep this height until I find that it's a problem. I don't want to cut off more than I need to. I ordered the SGII, so I'll have to try A-B-A tests and see if/what the difference is.
Update: I was hitting the ground a few times, so I removed an inch from the bottom and it's doing much better now. I also bolted on a wood board cut into 3 sections (wide in the middle, shorter ones to the sides) so that it holds shape better and if it does hit the ground now, instead of a smaller area getting all the force it is spread over a few feet and requires less maintinence.