On court I started with my regular set up, the racquet at 52lbs. Everything felt great and I was hitting the ball well. After about 15 minutes I was fully warmed up and switched to the 30lbs racquet. Amazingly, my shots were staying in and the strings actually felt lower powered. The ball felt like it was flying on me more with the 52lbs racquet than the 30lbs racquet — that was a huge shock to me.
Most interestingly, I was getting a lot of spin with the 30lbs racquet. Switching back and forth between the two racquets, my hitting partner could see and feel an immediate difference on the spin of my shots between the two racquets. I was getting excellent hop on my topspin, but best of all was the slice.
In other words, a lower tension means less power and more spin due presumably to the strings sliding more easily.
So you don't need a new Wilson racquet with fewer strings to get more spin.
Nadal is to tennis what 4'33" is to music.