By placing them below the deck, didn't you just lose another 2" of ground clearance?
Did you consider placing them behind the lip of the deck and flush with it on the bottom?
Seems this would have given you the same protection and strength, but not lowered your ground clearance by 2".
We work the heck out of our 2006 on a very rugged 50 acre horse farm. But fortunately we've never bottomed it out.
Great job fabbing your rockers, it looks like they belong on the machine.