Thats what the motor is rated to. But that does not mean, that it will automatically limit to that.

If you prop is too big, it will draw so much current, that the “motor current limit” in the VESC will be reached. At that point, the VESC will simply limit the dutycycle to whatever value needed to keep the current below said maxiumum, therefore limiting the motor voltage (motor voltage = battery voltage * duty cycle (roughly). And as power = voltage * current, the power will also be limited.

If this is the case, the solution is to make the propeller smaller, so the current limit is reached later.

Think of it the other way:

The torque produced is proportional to motor current. If motor current is limited, also torque is limited. Lets say your prop is too big, needing a lot of torque to spin, therefore not coming up to speed.

Power = 2 * PI * torque * RPM

If the RPM are low and the torque is limited to some value, the mechanical output power will also be low.

Make the propeller smaller, then the max torque will be reached at higher RPM, so also mech. power will be grater (and the whole system much more efficient)

In order to estimate needed pitch of the propeller, you can use this tool: Propeller-Rechner

If you have the 190kV motor, you can reach up to 8000rpm at full duty. If you want to drive at 22kmh, you only need 2" of pitch on that propeller.

With a common 5" or 6" propeller you will overload the motor / VESC