Recently got back into tennis after a looong hiatus. My first experience with poly was with Luxilon M2 Pro 16L, on my old Yonex RQ1500. Very positive experience, good control and spin. After a few months, switched sticks to a Vcore 89T, strung with Tour Bite 17 (55 main/53 cross). Wow! A big step up in power and spin. I attributed much of this at the time to the heavier racquet and the shaped poly. Anyway, I played the heck out of the new pair of racquets...after 2 months, my shots were starting to feel strange- either falling too short or too long. I assume that's the feeling of dead poly. So I restrung with Lux Alu Power 16L, lowering tension to 52/50. Just took it out for a light hit, it felt very different from TB 17! Hard to describe, but it felt a bit boardy. Much less pop than the Tour Bite. Perhaps I need to let it break in. Are these strings that much different in feel? My initial reaction was that I wanted to go back to TB. Or perhaps even try the new TB 19.