In addition to the previous comments, with some carb / engine combinations, the best LS needle setting may be very lean. Even to the point where the engine will not take throttle until it warms up a bit. If the LS was set any richer, the midrange was way rich. My DA50 was this way but most engines adjust the low needle as described above. With regards to the original question, its really more about the transition from low to full throttle than any other point.