thank you for sharing your opinion about this sim!
To your 172 stall speed notice:
The AeroflyFS Cessna 172 was initially set up fully loaded (4 persons and full fuel tanks). After one of the patches the weight got reduced to fit the normal climb performance better. Maybe it stil is heavier than your real C172 which makes it stall quicker.
Another possible explaination is the calibration of the airspeed in your real C172. The simulated pitot tube does not simulate the airflow effects of the nearby wing. As the angle of attack increases the pitot tube messures less accurate. This effect is even bigger mear a wing because the wing affects the airflow in front of it aswell and redirects the air in an even higher angle in relation to the pitot tube. That results in a falty messurment of the airpressure which the airspeed indicator relies on.
In short: The real pitot tube suffers effects that are not simulated.
It is possible to fake such an effect in the AeroflyFS. You could reduce the messured airspeed as a function of the angle of attack and the yaw angle. It means extra work and a proper calibration messurement in the real aircraft which is also expensive. And on top of that: Not every C172 may have the same airspeed indicator. Some airspeed indicators may be show another calibrated airpseed (CAS) than others.
The saver way is to let the simulation aircraft stall earlier but with the same angle of attack.
I can't say this enough: Its not the speed that creates the stall its the angle of attack!
Technically you could fly mostly by an AOA indicator. It would be much safer than a airspeed indicator. (Speedstalls, CAS, TAS, etc...)
Many good flights,