CAN YOU CHECK THESE PLEASE:

1.We followed the protocols precisely with test results yielding further opportunities for experimentation. Rewrite: The test results of the protocols no longer will permit opportunities for future experimentation.

1.Customers' complaints have been held to a minimum. Rewrite: All of the customers’ complaints have been held to a minimum until further notice.

1. Your rewrite is the exact opposite of the original statement. Frankly, I don't see anything wrong with the original statement.

2. Better would be a more specific statement, defining minimum. You could also say, "We have few customer complaints."