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Carl I doubt there was less spin on the ball but rather the Speed Glue era allowed for more dwell. Don't you remember how easy it was with rubbers to punch just about any topspin ball with a thick medium sponge. I remember having all of those cheap chinese rubbers hacked up on the speed glue/booster and could hit any topspin easily with my BH punch.
Sorry Mr RicharD but you can see how much flatter the trajectory of the ball is from his backhand back then. They are totally different shots and his backhand is weak. Just have a look and compare it to what he is doing now. And, I am pretty sure that all the Chinese players are using Tenergy that has been boosted so I wonder how much less effect their rubbers get now from what Ma Long was using back in 2006.
I don't care what rubber you are using though. A punch block is not going to have the same spin as a full loop stroke.
And back then Ma Long could not go backhand to backhand with a player who had a good backhand. Now he can go backhand to backhand with almost anyone including Zhang Jike and Seiya Kishikawa.