Verification rate of face recognition model

I tested your model (**dlib_face_recognition_resnet_model_v1**) using LFW, but result is 85%, while you told us it has accuracy 99.38%. I wonder if any recommendation to boost the accuracy. I think the problem in face preparation before feature extractor. After we determine the five points of landmarks, what is the next steps **(the alignment method, centered method for the faces).**
thanks in advance.