going down to the mid 50s is a major change for me...I am used to the low 60s on about everything. It all comes down to what you are used to. When I used to play with Wilson 90s, it always seemed like there was a sweet spot for tension where once it went too low you were just launching the ball...too high and it seemed like the ball would just pancake off the string bed without bite. I picked up some Vcore 89s... I am hoping they are not as temeperamental with strings.
Luxilon....10/10 would big banger