This should be stopped and made a STICKY!!!.. Finally all the bs theories on spin are not mentioned, and ricardo and Tommy Haas have got it! If you swing fast, you make alot of power AND SPIN. Its the slower swing speed guys that notice, "Wow, I make alot of spin with this low tension setup!"
Anyone curious about "snapback", just do what i did, copy the experiment TW did. They strung every other cross. I did this on a super tight 18x20 string pattern head Microgel Midplus, my main racket a couple years back.
It was AWESOME! didn't have to swing that fast, made gobs o spin, serve kicked like crazy!.. And, the strings?.. they lasted.. 1 day. haha 2 MAX!
I was about to try KEVLAR next, as i loved it soo much, but then the 95s came out and i used that, not nearly as radical as my "radical" string job. But strings lasted 1 MONTH vs day (*previous same string job using all the holes on microgel, lasted 3 to 6 MONTHS! haha) (btw i use something between a eastern forehand and semi-western forehand, so, yes, more federer DRIVING spin vs the Nadal pure heavy spin just purely based on grips)
And then I learned about "launch angle", even though i won more than my fair share of hitting heavy looping topspin deep to frustrate the pushers who used to frustrate me!(still think i should keep one in my bag just for the pushers, but don't! haha) And demoed the Yonex AI98 and never looked back!
I can swing as insanely fast as I can with this racket, and the higher i string my racket, the more a)power, b)spin, c)control I get. I am now stringing at 72/68 which averages out after the strings break in to about 63 and then a couple weeks later to like 58.
This is what Pete Sampras knew. If u take a flexible string, and string the hell out of it, and can provide the FORCE necessary to MOVE it, one makes MUCH MORE FORCE(aka power) than the lower strung string(the visual that goes through my head is a bow and arrow setup). I had an all poly setup, but it made almost too much spin, not enough driving past my opponent power, so I did the same with a multi cross, and I am DONE! Just the perfect string setup.. for me. For Joe the pusher that slowly blocks and swings his racket?(I have given this to him/her just to see what would happen), no, nothing, nada, can barely get the ball over the net! haha