The S5 will seem a little slow on the bottom if it's lean or rich on the LSN. The best way to know what the engine needs is to recognize when the bottom end seems soft. Does it start out with good snappy bottom end then lose the snap as you run longer? If so that means your LSN is too lean. If you never seem to have good response from the bottom end then you are probably too rich on the LSN. Remember that when you lean the LSN you will need to lower the idle, and if you richen up the LSN you will need to raise the idle.