I don't know how experienced you are with EAC but what speed did you set it to record.
Be very careful when you hear the word Best. When someone uses that word best without validating it, I think twice. There is no such thing as best for very long, expecially in the computer business. I am not putting down Plextor, but one mans best is another man's worst. You have to examine what needs you have then find whats right for you.
I would try it as master, I believe that is recommended but I am no Plextor Pro. I am a Liteon guy.