Hello acchance,
Your method sounds okay and if some Pine bark mulch can be found,add about as much or more as the peat.Sulfur can be put in now too.It may be a good idea to pre moisten the peat. Brady

Acchance,

Keep the bushes as far away from that wall as you possibly can. The cement is going to make the area near the wall quite alkaline. As Brady said pine fines and peat and make sure peat is wet. You are going to need to cut the bushes back......I would go back 1/3 but it all depends on how the roots look and how the bushes were dug.

If you have naturally alkaline soil, it would be a good idea to put about one pound of agricultural sulfur into the bottom of each hole, before planting the blueberry shrub. I prefer to mix either peat moss or composted tree leaves with our native soil, about 50/50 by volume, when planting blueberries. They should be watered in well, and watered once or twice a week through the fall. If your well water is alkaline, you will have pH issues, and the shrubs will likely fail to thrive. You might see pale green or yellow leaves next spring. If that happens, it is time to learn more about pH, how to measure soil pH, and how to measure water pH. There is help to be found on this forum.