The fellow who gives checkouts at my field has a habit of pulling the trottle and announcing "you just lost the engine" right after you have selected carb heat on the downwind checks
Keep the base leg tight and once the field is made start adding flap to bring the aim point back to the button (it's a short runway) .
40 flaps works just fine as long as you keep your speed up until flare. Our usually uphill slope bleeds off the airspeed in no time at all.