When I set up with my 9 iron I hit it solid so when i set up with my 7 or 8 iron do I move the ball away from my body more or adjust my height or both?

My rule of thumb is the higher the loft place further back in your stance , I hit my 9 and 8 from the same spot and my 6 and 7 from the same spot. Line up middle to back starting with your 3iron.