The notches on that ratchet bar (part #8) I'd guess move the deck 1/2 to 3/4 of an inch between notches.
I'm having trouble envisioning the o.p.'s problem of the cut being too low and then too high by moving the arm-strong lever just one notch.
I wouldn't give it any thought, but maybe he's mowing a putting green.
That being said, I have seen the slot at the bottom of the arm-strong lever (part #11) worn so bad that it lets the rod (part#6) rotate and not hold in position like it should,
but regardless the chosen cut height would remain constant.
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