That sounds like darn good production from two bushes!!
Especially younger bushes!!
You say you "Cut down" the stunted bush. If you didn't dig up the root crown, it will produce new canes this year and will reinvigorate the bush. Don't mow that spot, and keep the water on it.
Some our best production has come 3-4 years after mowing the things down.
It's a common practice to get rid of a bad Phomopsis infection in a field. 3-4 years later, they are back to producing, and healthier than before.
It makes me wonder if the thing got a bad case of Phomopsis or Botrytis. Blueberry bushes grow well in partial light, and are commonly found wild at the edges of clearings in the shade.
If you don't Fertilize, consider amending a bit this year, based on tissue samples.
Fruit production relys on Ca and Mg, and the bushes absolutely hammer the soil during a heavy production year.
Soil samples taken in spring and fall show it clearly...even with fertilizer and Cal-Mag applied. It drives me nuts, because I can never get ahead, and the things will go from sufficient to deficient in just a couple seasons.
Got any pics of the fruit and leaves? I might be able to discern variety. Some are obvious.