Importance of initial ignition timing

Some bad throttle response has improved into normal reaction by resetting the ignition timing at the regular BTDC angle, 7,5 degree precisely. After the change of fuel from premium to regular one, the carburetor and ignition timing are clear to be in good conditioned or not. Though it took me 3 days to seek and find out the best ignition timing and idle mixture control, I found out that anything is possible for anyone if it was attempted with some good patience. The transient of the motor form low speed to middle speed become natural and coaching phenomena and jerky motions at starting phase disappeared. Too much earlier ignition timing than BTDC 7.5 degree causes several inconveniences in the acceleration movements such as coughing, sluggish hesitation and confusion especially from low speed to middle one.