Why Do Some Cues Generate More Spin?

Yes, typically Ash is a bit stiffer or less flexible than rock maple...
That is inaccurate. Ash is a tough but flexible wood. That is why it is used in baseball bats.
Think of the pole used for pole vaulting. The flex launches the vaulter. A flexible cue will have the same effect on a smaller scale.
Cole Dickson explained to me how a more flexible shaft is desirable for games like nine ball, while a stiffer shaft is desirable for a game like straight pool. When you are typically moving the cue ball over longer distances the flex helps. When you need short but pin point shape a stiff shaft with less deflection will allow for more precise cue ball placement.
Snooker balls are smaller and lighter so the cue would not experience the same degree of flex as when hitting a pool ball.
 
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Hardness and strength tests for wood.

From wikipedia; http://en.wikipedia.org/wiki/Janka_hardness_test

The Janka hardness test measures the resistance of a sample of wood to denting and wear. It measures the force required to embed an 11.28mm (.444 in) steel ball into wood to half the ball's diameter. This method leaves an indentation. A common use of Janka hardness ratings is to determine whether a species is suitable for use as flooring.

Hard Maple / Sugar Maple 1450
Ash (White) 1320

From this site; http://www.woodbin.com/ref/wood/strength_table.htm

Strength Properties of Commercially Important Woods.

Impact Bending, Height of Drop Causing Failure in inches.

Ash, White 43
Maple, Sugar 39
 
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