italia458 you obviously have some difficulties with equations and aerodynamics, I don't think this is the right place to address those at that level. Maybe you should read a good book on this topic, I recommend Darrol Stinton.
In a turn, it is not the outside wing that has the higher stall speed, it is not the inside wing either. They both have the same stall speed, otherwise the designer of the aircraft needs to be shot. You will also find that in a turn, it is the inside wing that will stall first because it is flying at a slightly lower speed and higher angle of attack - just the opposite of what you are saying.
On your statement that increasing angle of attack increases stall speed: it is the load factor that increases stall speed, it does not matter how you increase the load factor. Your are stating a general problem via one of its particularities - so that requires further explanations and it is a lot of trouble for nothing.
If you want a good understanding of stall, focus on angle of attack. The way you express stall margin as a speed that is above or below the one of your airplane is extremely confusing and impractical.