Your approach speed should be 1.3 times the stall speed in the configuration you are using. Usually stall speeds in GA airplanes are published for maximum gross weight. Since your weight is most likely less than maximum gross if you use the published stall speed to figure your approach speed you will still be fast. There is a formula for determining the decrease in stall speed with a decrease in weight but I can’t remember it off the top of my head. It’s the same principle as pushing the nose over in an upset to decrease your stall speed. At an “extreme” example at the top of a loop an airplane’s airspeed will be well below the published stall speed yet as long as you push (decreasing the aircraft’s weight), you will not stall and will have full aileron effectiveness (which is how you do a half Loop with a roll).
Hope this helps instead of confusing.