I'm female, 50s, 3.5. I just switched from a Cat 7 to a Cat 4 because I found swinging the Cat 7 unwieldy. I used Powerfiber 16 in my Cat 7 and liked it very much. I think it might be too springy (for want of a better word--you tell me) for the Cat 4, which is so light and more powerful. I think the Cat4 needs some lead tape to give it more stability. How would it play with gut? I've really been wanting to try it. I'm just not getting my shots deep enough but I do really like the feel of this racquet and it's great at serves and volleys for me. If not gut, what would give me more oomph on my shots with this racquet? If I put lead tape, in order not to change the balance but to make it more stable, should I put it at the throat? Thanks very much!