Saw an earlier post of yours regarding multi m and poly x. I am currently playing Head Lynx 17 full bed in my Head Instinct MP. I have lately had some strange tingling in my elbow. I always string at 55lbs, but have now moves to 50lbs, which is somewhat better. I still have an older set of Wilson NXT Duramax 15L in my tennis bag. Will a 15L in the mains work with a 16L smooth poly in the crosses?