ive tried out a whole range of recenttly,
my lowest 43lbs,
my highest 69lbs,
i find that different strings feel better to me at different tensions, thus making me string at different tensions when i choose the strings
polys good on high 40s
semi poly good on low 50s
synt gut good on high 50s
i dont know what effect this going to have on my racquets, but i guess i have a cheap and sturdy enough racquet not to be too concerned about
i guess a graphite racquet is better at handling the tensions changes as i have done
a soft frame racquet possibly would not handle tension changes as well