I was reading a section on tenniswarehouse that mentioned stringing a poly & nat. gut blend to help durability and feel. I wanted to do this (i have my own machine) but have only used one type of string in my past. Im going to be using syn. gut since i have a huge roll of it sitting around the house. My main question is, do they want me to string every other main with the 2 types of strings? Pattern being: syn/poly/syn/poly? what do you use for the crosses then? thanks in advance for your help guys!