I have a builder client who has a bad batch of engineered flooring which is bowing and cupping after installation on a concrete slab. The flooring has been tested for moisture and normal, the concrete has been tested for moisture and normal and the flooring company has continued to say there is noting wrong with the product. The installer is very professonal with years of installing this product with no other problems. The flooring is bowing and cupping before and after installation resulting in the joint pulling apart and an uneven floor. Any ideas on continued testing of the wood product and any good ideas on a testing lab that could do the test?