I'm using Tecnifibre Pro Red code 16 on the mains of a HEAD flexpoint prestige mp which is 18 x 20 and I have a little problem. I first divide the original packet into half to get half a set of the string, then i measure half of the remaining to get the string distance for each side of the racquet. the packet says 20 feet, but when i get to the end of the the mains on each side, there is barely enough string to finish. im using an electric stringer so that it has to coil the string around at least two times in order to apply the tension, and at the end its impossible to apply the tension cuz there's not enough string. does anyone else get this problem and what is your solution?