Our opinion is that most polys play best at around 50lbs although the tendency of young high level players is to string somewhere in the mid 40s. For aWhat do you consider " mid tension" on a racquet? Mid as in mid tension of the recommended racquet tension or something else, i.e., mid 50's. Just making sure I understand what you mean. I am looking to use the Firewire and do not want to waste the time on it of I am stringing it too tightly. I normally string at 58 lbs mains and 55# crosses. Some strings do not do well above a certain tension.
multifilament string on the other hand a 55-58 range sounds about right.