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Here is a pad for stairs that is integrated in the original pad ( unlike yours . I'm guessing your house is on piers and you have a slab poured to build steps on ) , but note the finished height of slab ,and depth ( thickness) of base on which stairs will sit . It is within inches of the grade you said yours was to be .
Other option would be tear out the pad and pour concrete steps with footings as a monolithic pour , you could back fill your form on the stair section so you weren't using as much concrete ( similar to the chainwall method)
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