The touch is up to the player...I travelled with a 18.5 Joss and a 20.25 Szamboti....
...my touch felt good with either one.
Jimmy Moore had a fantastic touch...with a 21 ounce cue.
I am talking about for a challenging near vertical perfect masse.
Touch hardly matters for horizontal shooting, you might as well use a mop broom for horizontal shooting, its good enough most times.