My son is a tournament player in his teens and he plays with a Technifiber Redcode (Poly). My younger son is 7 and plays a lot of tournaments with a 25" frame. The strings are a year old now and looking worn. Should I re-string it and with what. He has good topsin ground strokes and is very advanced for his age having had lots of instruction for several years. He recently won a 10 and under tournament. Would the technifiber redcode be a bad string choice for such a young player? I am sure he would get more bite on the ball.