My blueberry plants have not excelled . I transplanted them in compost and soil mixture.The soil is a heavy clay forest soil. I bought a load of sand, and I also have a well composted pile of a combo of cow manure, grass clippings, leaf mold and a small amount of chicken manure. I was planning on mixing the compost and sand equally and digging out the plants, shake off as mush soil is around the plant, and use this mixture I just described. Will it work?