Your initial photo brings up the issue of weight distribution that was so VERY important in the days of Balsa 2 channel RC models and earlier.
The lift distribution on each wing is not linearly distributed across the entire wing span. The portion closest to the fuselage generates most lift and the wing tip generates none. Mind you generally the lift differences between wings is minimal.
The weight that each wing supports must be equal for level and stable flight. If one wing has a heavier loading then the plane will turn and roll in the direction of the heaviest wing.
Not only must the weight be equally distributed between the wings but ALSO the weight must be equally distributed. This means that when fitting a load to the wing externally, (bombs, motor nacelles, parasitic flighter etc), their weight multiplied by the distance from the fuselage centre line must be equal. If one wing has its load further from the fuselage centre line than the other wing the plane will turn and roll towards the side that has its load furtherest from the fuselage.
It is simply that the overall centre of mass is no longer on the fuselage centre line and one wing becomes more hevily loaded than the other.
Do a little investigation into assymetrical flight and you will soon discover it is always just a matter of weight and lift balance.
Just what works for me!
Have fun!