I buy two matched Pure Drives from TW and have them install Babalot Addiction monofilliment at 60 and 58lbs. I play with them for 6 sets. They feel perfect. TW uses a lock out. I want to use Gut so I measure the Strings with my ERT 300 and it says DT 35. I have a wise head so I string both rackets at 62 and 60 and the DT is 38. 24 hours later it is 37. I play 6 sets with both rackets and the DT is then 34. I play with both again tonight 3 sets and the DT is 32 and I am hitting long. A friend of mine says I am stringing the gut too tight and that is why it is loosing so much tension. I have a match this weekend and need to get the rackets right. Should I string the gut around 65 to end up with a DT of 35? Maybe I should buy some addiction but what number to string it at?