Looks fine to me. If you were to lean the board back on on the heel side you'd need about 70 degree angle to drag the heel. That's pretty aggressive carving.
I wear size 10 boots and use medium bindings (EST) and generally the binding is centred to give equal overhang. With size 8 boots I'd expect that you would want to push the bindings towards the toe side since the heel of the boot doesn't change placement in the binding so you have to move it to the toe side to balance things out. So I would expect that you would need the binding pushed forward to make up for the shorter length of your boot compared to mine.
I guess the risk is that if you feel you need to go more toeside you are stuck, but I am confused by your first picture; it looks like you still have room to move the binding to the toeside based on the screw heads.