Can someone here compare these three strings? I have used both 850 Pro Spin and RIP Control, but on different racquets. RIP control seemed a little stiff on my arm for some reason (most likely because of my old racquet 'Prince NXG MP'). 850 Pro Spin feels crisp and very control oriented with decent spin on my RDX 500. So far, I've played a good 10 hours in doubles and no notching or movement. I've not yet used X-1 Biphase. Please compare the 16 guages in terms of power, control, shock and durability.