You're confused because you are making things up. Vls in clean config is 1.28
Vs not Vs1. It is in the fundamental stalling lesson in PPL that with bank angle or weight increase the stall speed increases.
For your reference I have provided all copied and pasted links which I hope help you understand.
From a320 FCOM 3.4.10:
VLS : Lowest Selectable speed.
Represented by the top of an amber strip along the airspeed scale on the PFD.
Computed by the FAC based on aerodynamic data, corresponds to 1.13 VS during takeoff or following a touch and go.
Becomes 1.23 VS after retraction of one step of flaps.
Becomes 1.28 VS when in clean configuration.
Note : If in CONF 0 VLS were 1.23 VS (instead of 1.28 VS), the alpha protection strip would hit the VLS strip on the PFD.
Above 20000 feet, VLS is corrected for Mach effect to maintain a 0.2g buffet margin.
In addition, VLS increases with speed brakes extension.
The table wont properly copy but read across Bank Angle/Load Factor/Stall speed increase factor.
30° gives 1,15G which gives 1,07
45° gives 1,41G which gives 1,19
60° gives 2,0G which gives 1,41
75,5° gives 4,0G which gives 2
Turning
As can be seen in the table above, when the aircraft banks 30° the stall speed increases with 7% due to the fact that aircraft weight in a level turn increases by 15% caused by the increased load factor. Although load factor increases, the stalling angle of attack will remain the same.
Image shows clearly that in a 45° banked turn the amount of generated lift is much more than the vertical component which keeps the aircraft from descending in a level turn.
The equation to calculate this is:
Vs new = Vs old weight x √(new weight / old weight).
All taken from:
Stall Speed Factors, Weight, Load Factor, Turning, Altitude, Power, Flaps, Wing Contamination, Airplanes - EAI