Would a sharper leading edge increase lift and reduce drag at lower speeds?
The leading edge is round to allow a wider range of angles of attack. If the airfoil is operated at one angle of attack only, the leading edge can be sharp. See the leading edges of compressor blades or fowler flaps for example - the stator rsp. the wing ahead of them directs airflow such that the angle of attack variation on the airfoil is small, in case of flaps especially if the flap has only one extended position.

This means that your sharp leading edge works well because (by chance) it is exactly where the stagnation point in trimmed flight goes. Re-trim the aircraft for a different speed and the right-turning tendency will be reversed. Unfortunately, now you made both sides similar, so you cannot run this test directly.