Friendship/729 F-3 Hao Shuai

What is the best rubber for this racket?

Mine is 6mm thick, quite a difference to the stated 6.6mm. It has almost no vibration when you hit with it, feels very fast, and really smashes well. Due to low vibration, it also means little feedback.

The handles of the straight 729 blades are perfect; I find they fit in my large size hand very well, way better than, say, a Yinhe small rounded straight. These 729 ones are sort of squareish, and my theory is that this gives better feedback to me about the precise angle I’m holding it as I hit. Other 729 blades with these handles available are the F-1 and the Z-2.