Hello, we purchased blueberry bushes this spring. Last fall, in anticipation of planting blueberry bushes we ammended the soil with soil acidifier. After administering in early spring a rapitest for the ph level, the results were a ph level of 6. We added more soil acidifier and waited a month or so and tested again. The results were the same ph level of 6. We're unsure how to proceed. Do we add more acidifier, wait a bit and then plant? Or do we plant now and give the acidifier time to work with the bushes in the ground? How long does it take for the ph level to change with using the acidifier? Is there a different product we should use to change the ph level? Is the rapitest reliable? I thank you in advance for your assistance to these many questions! I so appreciate having this resource!!