I bought the $25 a pot for instant gratification, too. I even planted the last few bluebery bushes in 100% peat. I used ammonium sulfate, Miracid and sulfur. I had 7 bushes for 5 years. None grew taller than3-4 ft.
In my situation, it was the water. Our well water is so alkaline, it causes rings on toilet bowls. I need to install a rain barrel. Otherwise, I won't win the ph battle.
I still miss Chandler. The berries were large, the taste was good. I like blueberries that taste more sweet than tart.