I recently swapped my AT900T for a NS9900 and it's strung with NGB95 at about 23-24lbs. I'm having trouble generating power compared to my BS11 strung at 25x27lbs with BG80. Should I restring it the same so I can compare apples with apples, or add it to the pile of rackets I want to restring with a .66mm string of yet-to-be decided variant? Or is it just my weakling arm? Discuss.