Hello- would appreciate some string advice. I'm approaching 50 years old, have gotten back into tennis seriously over the past year. NTRP 4.0. Have recently used a Head Youtek Prestige MP, but recently demoed a Wilson BLX Blade 98 and played well. Liked a little bit of the "free power" with the Blade 98. Have only played with multi's in the past. Reading a lot about using a poly or co-poly with this racquet to harness some power. I have never had arm or elbow problems, but don't wish to develop issues by using a poly. Spencer of TW recommended using Weiss Mosquito bite for this racquet (an 18g copoly). Do you think I should stay with a multi( I like TF X/1 biphase), or try a soft co-poly or poly. If you think the soft poly/co-poly would be beneficial, which would you recommend? Thanks in advance for your help/advice.