I don't get super engorged unless he does something crazy like going from waking every couple hours at night to STTN.
My supply is still pretty good b/c I think he isn't really eating as much solids as a lot of babies his age.
But yeah your supply will adust to what the baby is taking so as baby gets older and eats more solids your supply will slowly go down. I just kind of wing it as far as when he nurses. Typically I nurse before and after each nap (he naps twice), waking up in morning and before bed (and night wakings

) but some of them he's not drinking a lot.