Quick update. I had another session with Bio 500T.
This time lack of power and spin was more noticable to me. Though i like feel, weight and balance. I really have to restring it with poly at lower tension to get more accurate idea how it plays. Dunlop Silk at high tension is not good match for this type of racquet.
POG 100 - SP Firestorm (1.25) 49/46 lbs, Bio 400 Tour - Yonex PTP (1.20) 51/49 lbs