Hey man,
In that pic I had 215/35/18's up front and 215/40/18's out back. FK coilovers without helper springs, probably around 5 threads from the bottom, rear coils all the way down with both locking collars removed.
Frame was not notched. I ran the car with the axle banging for a very long time without any real negative impact to the car.
A skidplate will not allow for a very low ride height, unless you can find one that is pretty much flat and sits exactly as the plastic under the car already does.