Guys that is why predators are great cues for playing pool! They have both worlds hit and playability with out having to deal with the deflection issues of all custom cues.
I think this is a major issue with most players. Too stiff or too flexible.
For me a stiff shaft squirts my cue ball way too much sideways. A flex shaft I give up too much accuracy.
I tweak all my shafts to my personal feel. I like to play with an 11.75mm shaft and not all shafts play the same. When I find the "right" feel, it's a keeper.